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GitHub - nicolas-grekas/predis: A flexible and feature-complete Redis client for PHP.
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d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Product <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 d-lg-flex flex-wrap dropdown-menu-wide"> <div class="HeaderMenu-column px-lg-4 border-lg-right mb-4 mb-lg-0 pr-lg-7"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"github_copilot","context":"product","tag":"link","label":"github_copilot_link_product_navbar"}" href="https://github.com/features/copilot"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-copilot color-fg-subtle mr-3"> <path d="M23.922 16.992c-.861 1.495-5.859 5.023-11.922 5.023-6.063 0-11.061-3.528-11.922-5.023A.641.641 0 0 1 0 16.736v-2.869a.841.841 0 0 1 .053-.22c.372-.935 1.347-2.292 2.605-2.656.167-.429.414-1.055.644-1.517a10.195 10.195 0 0 1-.052-1.086c0-1.331.282-2.499 1.132-3.368.397-.406.89-.717 1.474-.952 1.399-1.136 3.392-2.093 6.122-2.093 2.731 0 4.767.957 6.166 2.093.584.235 1.077.546 1.474.952.85.869 1.132 2.037 1.132 3.368 0 .368-.014.733-.052 1.086.23.462.477 1.088.644 1.517 1.258.364 2.233 1.721 2.605 2.656a.832.832 0 0 1 .053.22v2.869a.641.641 0 0 1-.078.256ZM12.172 11h-.344a4.323 4.323 0 0 1-.355.508C10.703 12.455 9.555 13 7.965 13c-1.725 0-2.989-.359-3.782-1.259a2.005 2.005 0 0 1-.085-.104L4 11.741v6.585c1.435.779 4.514 2.179 8 2.179 3.486 0 6.565-1.4 8-2.179v-6.585l-.098-.104s-.033.045-.085.104c-.793.9-2.057 1.259-3.782 1.259-1.59 0-2.738-.545-3.508-1.492a4.323 4.323 0 0 1-.355-.508h-.016.016Zm.641-2.935c.136 1.057.403 1.913.878 2.497.442.544 1.134.938 2.344.938 1.573 0 2.292-.337 2.657-.751.384-.435.558-1.15.558-2.361 0-1.14-.243-1.847-.705-2.319-.477-.488-1.319-.862-2.824-1.025-1.487-.161-2.192.138-2.533.529-.269.307-.437.808-.438 1.578v.021c0 .265.021.562.063.893Zm-1.626 0c.042-.331.063-.628.063-.894v-.02c-.001-.77-.169-1.271-.438-1.578-.341-.391-1.046-.69-2.533-.529-1.505.163-2.347.537-2.824 1.025-.462.472-.705 1.179-.705 2.319 0 1.211.175 1.926.558 2.361.365.414 1.084.751 2.657.751 1.21 0 1.902-.394 2.344-.938.475-.584.742-1.44.878-2.497Z"></path><path d="M14.5 14.25a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Zm-5 0a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Z"></path> </svg> <div> <div class="color-fg-default h4">GitHub Copilot</div> Write better code with AI </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"security","context":"product","tag":"link","label":"security_link_product_navbar"}" href="https://github.com/features/security"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-shield-check color-fg-subtle mr-3"> <path d="M16.53 9.78a.75.75 0 0 0-1.06-1.06L11 13.19l-1.97-1.97a.75.75 0 0 0-1.06 1.06l2.5 2.5a.75.75 0 0 0 1.06 0l5-5Z"></path><path d="m12.54.637 8.25 2.675A1.75 1.75 0 0 1 22 4.976V10c0 6.19-3.771 10.704-9.401 12.83a1.704 1.704 0 0 1-1.198 0C5.77 20.705 2 16.19 2 10V4.976c0-.758.489-1.43 1.21-1.664L11.46.637a1.748 1.748 0 0 1 1.08 0Zm-.617 1.426-8.25 2.676a.249.249 0 0 0-.173.237V10c0 5.46 3.28 9.483 8.43 11.426a.199.199 0 0 0 .14 0C17.22 19.483 20.5 15.461 20.5 10V4.976a.25.25 0 0 0-.173-.237l-8.25-2.676a.253.253 0 0 0-.154 0Z"></path> </svg> <div> <div class="color-fg-default h4">Security</div> Find and fix vulnerabilities </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"actions","context":"product","tag":"link","label":"actions_link_product_navbar"}" href="https://github.com/features/actions"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-workflow color-fg-subtle mr-3"> <path d="M1 3a2 2 0 0 1 2-2h6.5a2 2 0 0 1 2 2v6.5a2 2 0 0 1-2 2H7v4.063C7 16.355 7.644 17 8.438 17H12.5v-2.5a2 2 0 0 1 2-2H21a2 2 0 0 1 2 2V21a2 2 0 0 1-2 2h-6.5a2 2 0 0 1-2-2v-2.5H8.437A2.939 2.939 0 0 1 5.5 15.562V11.5H3a2 2 0 0 1-2-2Zm2-.5a.5.5 0 0 0-.5.5v6.5a.5.5 0 0 0 .5.5h6.5a.5.5 0 0 0 .5-.5V3a.5.5 0 0 0-.5-.5ZM14.5 14a.5.5 0 0 0-.5.5V21a.5.5 0 0 0 .5.5H21a.5.5 0 0 0 .5-.5v-6.5a.5.5 0 0 0-.5-.5Z"></path> </svg> <div> <div class="color-fg-default h4">Actions</div> Automate any workflow </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"codespaces","context":"product","tag":"link","label":"codespaces_link_product_navbar"}" href="https://github.com/features/codespaces"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-codespaces color-fg-subtle mr-3"> <path d="M3.5 3.75C3.5 2.784 4.284 2 5.25 2h13.5c.966 0 1.75.784 1.75 1.75v7.5A1.75 1.75 0 0 1 18.75 13H5.25a1.75 1.75 0 0 1-1.75-1.75Zm-2 12c0-.966.784-1.75 1.75-1.75h17.5c.966 0 1.75.784 1.75 1.75v4a1.75 1.75 0 0 1-1.75 1.75H3.25a1.75 1.75 0 0 1-1.75-1.75ZM5.25 3.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h13.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Zm-2 12a.25.25 0 0 0-.25.25v4c0 .138.112.25.25.25h17.5a.25.25 0 0 0 .25-.25v-4a.25.25 0 0 0-.25-.25Z"></path><path d="M10 17.75a.75.75 0 0 1 .75-.75h6.5a.75.75 0 0 1 0 1.5h-6.5a.75.75 0 0 1-.75-.75Zm-4 0a.75.75 0 0 1 .75-.75h.5a.75.75 0 0 1 0 1.5h-.5a.75.75 0 0 1-.75-.75Z"></path> </svg> <div> <div class="color-fg-default h4">Codespaces</div> Instant dev environments </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" 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href="https://github.com/features/code-review"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-code-review color-fg-subtle mr-3"> <path d="M10.3 6.74a.75.75 0 0 1-.04 1.06l-2.908 2.7 2.908 2.7a.75.75 0 1 1-1.02 1.1l-3.5-3.25a.75.75 0 0 1 0-1.1l3.5-3.25a.75.75 0 0 1 1.06.04Zm3.44 1.06a.75.75 0 1 1 1.02-1.1l3.5 3.25a.75.75 0 0 1 0 1.1l-3.5 3.25a.75.75 0 1 1-1.02-1.1l2.908-2.7-2.908-2.7Z"></path><path d="M1.5 4.25c0-.966.784-1.75 1.75-1.75h17.5c.966 0 1.75.784 1.75 1.75v12.5a1.75 1.75 0 0 1-1.75 1.75h-9.69l-3.573 3.573A1.458 1.458 0 0 1 5 21.043V18.5H3.25a1.75 1.75 0 0 1-1.75-1.75ZM3.25 4a.25.25 0 0 0-.25.25v12.5c0 .138.112.25.25.25h2.5a.75.75 0 0 1 .75.75v3.19l3.72-3.72a.749.749 0 0 1 .53-.22h10a.25.25 0 0 0 .25-.25V4.25a.25.25 0 0 0-.25-.25Z"></path> </svg> <div> <div class="color-fg-default h4">Code Review</div> Manage code changes </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block 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20H10.75A1.75 1.75 0 0 1 9 18.25v-1.465a.75.75 0 0 1 1.5 0v1.465c0 .138.112.25.25.25h5.5a.75.75 0 0 1 .53.22l2.72 2.72v-2.19a.75.75 0 0 1 .75-.75h2a.25.25 0 0 0 .25-.25v-9.5Z"></path> </svg> <div> <div class="color-fg-default h4">Discussions</div> Collaborate outside of code </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"code_search","context":"product","tag":"link","label":"code_search_link_product_navbar"}" href="https://github.com/features/code-search"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-code-square color-fg-subtle mr-3"> <path d="M10.3 8.24a.75.75 0 0 1-.04 1.06L7.352 12l2.908 2.7a.75.75 0 1 1-1.02 1.1l-3.5-3.25a.75.75 0 0 1 0-1.1l3.5-3.25a.75.75 0 0 1 1.06.04Zm3.44 1.06a.75.75 0 1 1 1.02-1.1l3.5 3.25a.75.75 0 0 1 0 1.1l-3.5 3.25a.75.75 0 1 1-1.02-1.1l2.908-2.7-2.908-2.7Z"></path><path d="M2 3.75C2 2.784 2.784 2 3.75 2h16.5c.966 0 1.75.784 1.75 1.75v16.5A1.75 1.75 0 0 1 20.25 22H3.75A1.75 1.75 0 0 1 2 20.25Zm1.75-.25a.25.25 0 0 0-.25.25v16.5c0 .138.112.25.25.25h16.5a.25.25 0 0 0 .25-.25V3.75a.25.25 0 0 0-.25-.25Z"></path> </svg> <div> <div class="color-fg-default h4">Code Search</div> Find more, search less </div> </a></li> </ul> </div> </div> <div class="HeaderMenu-column px-lg-4"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0 border-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="product-explore-heading">Explore</span> <ul class="list-style-none f5" aria-labelledby="product-explore-heading"> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"all_features","context":"product","tag":"link","label":"all_features_link_product_navbar"}" href="https://github.com/features"> 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0l-5.25 1.68a.25.25 0 0 0-.174.238V7c0 1.358.275 2.666 1.057 3.86.784 1.194 2.121 2.34 4.366 3.297a.196.196 0 0 0 .154 0c2.245-.956 3.582-2.104 4.366-3.298C13.225 9.666 13.5 8.36 13.5 7V3.48a.251.251 0 0 0-.174-.237l-5.25-1.68ZM8.75 4.75v3a.75.75 0 0 1-1.5 0v-3a.75.75 0 0 1 1.5 0ZM9 10.5a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path> </svg> </span> <span data-view-component="true" class="ActionListItem-label"> Security </span> </a> </li> <li hidden="hidden" data-menu-item="i5insights-tab" data-targets="action-list.items" role="none" data-view-component="true" class="ActionListItem"> <a tabindex="-1" id="item-6a8633ef-9bde-48df-8ba1-72e0a3d8847b" href="/nicolas-grekas/predis/pulse" role="menuitem" data-view-component="true" class="ActionListContent ActionListContent--visual16"> <span class="ActionListItem-visual ActionListItem-visual--leading"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-graph"> <path d="M1.5 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dir=\"auto\"\u003ePredis\u003c/h1\u003e\u003ca id=\"user-content-predis\" class=\"anchor\" aria-label=\"Permalink: Predis\" href=\"#predis\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"/nicolas-grekas/predis/blob/main/LICENSE\"\u003e\u003cimg src=\"https://camo.githubusercontent.com/385e5939d094ffe013fe3799516c37ee4c59f54d811f5901ba5372bd1d711bed/68747470733a2f2f696d672e736869656c64732e696f2f6769746875622f6c6963656e73652f7072656469732f7072656469732e7376673f7374796c653d666c61742d737175617265\" alt=\"Software license\" data-canonical-src=\"https://img.shields.io/github/license/predis/predis.svg?style=flat-square\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\n\u003ca href=\"https://packagist.org/packages/predis/predis\" rel=\"nofollow\"\u003e\u003cimg src=\"https://camo.githubusercontent.com/f9052f8cc4430083c1e6fecd9e6b44f84b9745a7b13004ff7791dd15c86c6ef3/68747470733a2f2f696d672e736869656c64732e696f2f7061636b61676973742f762f7072656469732f7072656469732e7376673f7374796c653d666c61742d737175617265\" alt=\"Latest stable\" data-canonical-src=\"https://img.shields.io/packagist/v/predis/predis.svg?style=flat-square\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\n\u003ca href=\"https://packagist.org/packages/predis/predis\" rel=\"nofollow\"\u003e\u003cimg src=\"https://camo.githubusercontent.com/c538878dc03daf3d01ce5f59beb742df48f330d161cbbeb3568c84059efb9aa9/68747470733a2f2f696d672e736869656c64732e696f2f7061636b61676973742f767072652f7072656469732f7072656469732e7376673f7374796c653d666c61742d737175617265\" alt=\"Latest development\" data-canonical-src=\"https://img.shields.io/packagist/vpre/predis/predis.svg?style=flat-square\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\n\u003ca href=\"https://packagist.org/packages/predis/predis/stats\" rel=\"nofollow\"\u003e\u003cimg src=\"https://camo.githubusercontent.com/7928e294e5bc2f7602247fb4e1a5c8ffb31eded513016ee28457949a73fc7fd4/68747470733a2f2f696d672e736869656c64732e696f2f7061636b61676973742f646d2f7072656469732f7072656469732e7376673f7374796c653d666c61742d737175617265\" alt=\"Monthly installs\" data-canonical-src=\"https://img.shields.io/packagist/dm/predis/predis.svg?style=flat-square\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\n\u003ca href=\"https://github.com/predis/predis/actions\"\u003e\u003cimg src=\"https://camo.githubusercontent.com/43bedd77ca9815a689bc23fbb2264162a6e88285005e58474cd5ed3c2b3e0ea2/68747470733a2f2f696d672e736869656c64732e696f2f6769746875622f776f726b666c6f772f7374617475732f7072656469732f7072656469732f54657374732f6d61696e3f7374796c653d666c61742d737175617265\" alt=\"Build status\" data-canonical-src=\"https://img.shields.io/github/workflow/status/predis/predis/Tests/main?style=flat-square\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eA flexible and feature-complete \u003ca href=\"http://redis.io\" rel=\"nofollow\"\u003eRedis\u003c/a\u003e client for PHP 7.2 and newer.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eATTENTION:\u003c/strong\u003e you are on the README file of an unstable branch of Predis specifically meant for the\ndevelopment of future releases. This means that the code on this branch is potentially unstable, and\nbreaking change may happen without any prior notice. Do not use it in production environments or use\nit at your own risk!\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ePredis does not require any additional C extension by default, but it can be optionally paired with\n\u003ca href=\"https://github.com/nrk/phpiredis\"\u003ephpiredis\u003c/a\u003e to lower the overhead of the serialization and parsing\nof the \u003ca href=\"http://redis.io/topics/protocol\" rel=\"nofollow\"\u003eRedis RESP Protocol\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eMore details about this project can be found on the \u003ca href=\"/nicolas-grekas/predis/blob/main/FAQ.md\"\u003efrequently asked questions\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMain features\u003c/h2\u003e\u003ca id=\"user-content-main-features\" class=\"anchor\" aria-label=\"Permalink: Main features\" href=\"#main-features\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eSupport for Redis from \u003cstrong\u003e2.0\u003c/strong\u003e to \u003cstrong\u003e3.2\u003c/strong\u003e.\u003c/li\u003e\n\u003cli\u003eSupport for clustering using client-side sharding and pluggable keyspace distributors.\u003c/li\u003e\n\u003cli\u003eSupport for \u003ca href=\"http://redis.io/topics/cluster-tutorial\" rel=\"nofollow\"\u003eredis-cluster\u003c/a\u003e (Redis \u0026gt;= 3.0).\u003c/li\u003e\n\u003cli\u003eSupport for master-slave replication setups and \u003ca href=\"http://redis.io/topics/sentinel\" rel=\"nofollow\"\u003eredis-sentinel\u003c/a\u003e.\u003c/li\u003e\n\u003cli\u003eTransparent key prefixing of keys using a customizable prefix strategy.\u003c/li\u003e\n\u003cli\u003eCommand pipelining on both single nodes and clusters (client-side sharding only).\u003c/li\u003e\n\u003cli\u003eAbstraction for Redis transactions (Redis \u0026gt;= 2.0) and CAS operations (Redis \u0026gt;= 2.2).\u003c/li\u003e\n\u003cli\u003eAbstraction for Lua scripting (Redis \u0026gt;= 2.6) and automatic switching between \u003ccode\u003eEVALSHA\u003c/code\u003e or \u003ccode\u003eEVAL\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eAbstraction for \u003ccode\u003eSCAN\u003c/code\u003e, \u003ccode\u003eSSCAN\u003c/code\u003e, \u003ccode\u003eZSCAN\u003c/code\u003e and \u003ccode\u003eHSCAN\u003c/code\u003e (Redis \u0026gt;= 2.8) based on PHP iterators.\u003c/li\u003e\n\u003cli\u003eConnections are established lazily by the client upon the first command and can be persisted.\u003c/li\u003e\n\u003cli\u003eConnections can be established via TCP/IP (also TLS/SSL-encrypted) or UNIX domain sockets.\u003c/li\u003e\n\u003cli\u003eSupport for \u003ca href=\"http://webd.is\" rel=\"nofollow\"\u003eWebdis\u003c/a\u003e (requires both \u003ccode\u003eext-curl\u003c/code\u003e and \u003ccode\u003eext-phpiredis\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eSupport for custom connection classes for providing different network or protocol backends.\u003c/li\u003e\n\u003cli\u003eFlexible system for defining custom commands and override the default ones.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eHow to \u003cem\u003einstall\u003c/em\u003e and use Predis\u003c/h2\u003e\u003ca id=\"user-content-how-to-install-and-use-predis\" class=\"anchor\" aria-label=\"Permalink: How to install and use Predis\" href=\"#how-to-install-and-use-predis\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis library can be found on \u003ca href=\"http://packagist.org/packages/predis/predis\" rel=\"nofollow\"\u003ePackagist\u003c/a\u003e for an easier\nmanagement of projects dependencies using \u003ca href=\"http://packagist.org/about-composer\" rel=\"nofollow\"\u003eComposer\u003c/a\u003e.\nCompressed archives of each release are \u003ca href=\"https://github.com/predis/predis/releases\"\u003eavailable on GitHub\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLoading the library\u003c/h3\u003e\u003ca id=\"user-content-loading-the-library\" class=\"anchor\" aria-label=\"Permalink: Loading the library\" href=\"#loading-the-library\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ePredis relies on the autoloading features of PHP to load its files when needed and complies with the\n\u003ca href=\"https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-4-autoloader.md\"\u003ePSR-4 standard\u003c/a\u003e.\nAutoloading is handled automatically when dependencies are managed through Composer, but it is also\npossible to leverage its own autoloader in projects or scripts lacking any autoload facility:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-php notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// Prepend a base path if Predis is not available in your \u0026quot;include_path\u0026quot;.\nrequire 'Predis/Autoloader.php';\n\nPredis\\Autoloader::register();\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e// Prepend a base path if Predis is not available in your \"include_path\".\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003erequire\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ePredis/Autoloader.php\u003c/span\u003e'\u003c/span\u003e;\n\n\u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\Autoloader::\u003cspan class=\"pl-en\"\u003eregister\u003c/span\u003e();\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eConnecting to Redis\u003c/h3\u003e\u003ca id=\"user-content-connecting-to-redis\" class=\"anchor\" aria-label=\"Permalink: Connecting to Redis\" href=\"#connecting-to-redis\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhen creating a client instance without passing any connection parameter, Predis assumes \u003ccode\u003e127.0.0.1\u003c/code\u003e\nand \u003ccode\u003e6379\u003c/code\u003e as default host and port. The default timeout for the \u003ccode\u003econnect()\u003c/code\u003e operation is 5 seconds:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-php notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$client = new Predis\\Client();\n$client-\u0026gt;set('foo', 'bar');\n$value = $client-\u0026gt;get('foo');\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eClient\u003c/span\u003e();\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e-\u0026gt;\u003cspan class=\"pl-en\"\u003eset\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003efoo\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ebar\u003c/span\u003e'\u003c/span\u003e);\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003evalue\u003c/span\u003e = \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e-\u0026gt;\u003cspan class=\"pl-en\"\u003eget\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003efoo\u003c/span\u003e'\u003c/span\u003e);\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eConnection parameters can be supplied either in the form of URI strings or named arrays. The latter\nis the preferred way to supply parameters, but URI strings can be useful when parameters are read\nfrom non-structured or partially-structured sources:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-php notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// Parameters passed using a named array:\n$client = new Predis\\Client([\n 'scheme' =\u0026gt; 'tcp',\n 'host' =\u0026gt; '10.0.0.1',\n 'port' =\u0026gt; 6379,\n]);\n\n// Same set of parameters, passed using an URI string:\n$client = new Predis\\Client('tcp://10.0.0.1:6379');\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e// Parameters passed using a named array:\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eClient\u003c/span\u003e([\n \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003escheme\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp\u003c/span\u003e'\u003c/span\u003e,\n \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ehost\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003e10.0.0.1\u003c/span\u003e'\u003c/span\u003e,\n \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003eport\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-c1\"\u003e6379\u003c/span\u003e,\n]);\n\n\u003cspan class=\"pl-c\"\u003e// Same set of parameters, passed using an URI string:\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eClient\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp://10.0.0.1:6379\u003c/span\u003e'\u003c/span\u003e);\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ePassword protected servers can be accessed by adding \u003ccode\u003epassword\u003c/code\u003e to the parameters set. When ACLs are\nenabled on Redis \u0026gt;= 6.0, both \u003ccode\u003eusername\u003c/code\u003e and \u003ccode\u003epassword\u003c/code\u003e are required for user authentication.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIt is also possible to connect to local instances of Redis using UNIX domain sockets, in this case\nthe parameters must use the \u003ccode\u003eunix\u003c/code\u003e scheme and specify a path for the socket file:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-php notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$client = new Predis\\Client(['scheme' =\u0026gt; 'unix', 'path' =\u0026gt; '/path/to/redis.sock']);\n$client = new Predis\\Client('unix:/path/to/redis.sock');\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eClient\u003c/span\u003e([\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003escheme\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003eunix\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003epath\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003e/path/to/redis.sock\u003c/span\u003e'\u003c/span\u003e]);\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eClient\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003eunix:/path/to/redis.sock\u003c/span\u003e'\u003c/span\u003e);\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe client can leverage TLS/SSL encryption to connect to secured remote Redis instances without the\nneed to configure an SSL proxy like stunnel. This can be useful when connecting to nodes running on\nvarious cloud hosting providers. Encryption can be enabled with using the \u003ccode\u003etls\u003c/code\u003e scheme and an array\nof suitable \u003ca href=\"http://php.net/manual/context.ssl.php\" rel=\"nofollow\"\u003eoptions\u003c/a\u003e passed via the \u003ccode\u003essl\u003c/code\u003e parameter:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-php notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// Named array of connection parameters:\n$client = new Predis\\Client([\n 'scheme' =\u0026gt; 'tls',\n 'ssl' =\u0026gt; ['cafile' =\u0026gt; 'private.pem', 'verify_peer' =\u0026gt; true],\n]);\n\n// Same set of parameters, but using an URI string:\n$client = new Predis\\Client('tls://127.0.0.1?ssl[cafile]=private.pem\u0026amp;ssl[verify_peer]=1');\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e// Named array of connection parameters:\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eClient\u003c/span\u003e([\n \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003escheme\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etls\u003c/span\u003e'\u003c/span\u003e,\n \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003essl\u003c/span\u003e'\u003c/span\u003e =\u0026gt; [\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ecafile\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003eprivate.pem\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003everify_peer\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e],\n]);\n\n\u003cspan class=\"pl-c\"\u003e// Same set of parameters, but using an URI string:\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eClient\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etls://127.0.0.1?ssl[cafile]=private.pem\u0026amp;ssl[verify_peer]=1\u003c/span\u003e'\u003c/span\u003e);\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe connection schemes \u003ca href=\"http://www.iana.org/assignments/uri-schemes/prov/redis\" rel=\"nofollow\"\u003e\u003ccode\u003eredis\u003c/code\u003e\u003c/a\u003e (alias of\n\u003ccode\u003etcp\u003c/code\u003e) and \u003ca href=\"http://www.iana.org/assignments/uri-schemes/prov/rediss\" rel=\"nofollow\"\u003e\u003ccode\u003erediss\u003c/code\u003e\u003c/a\u003e (alias of \u003ccode\u003etls\u003c/code\u003e) are\nalso supported, with the difference that URI strings containing these schemes are parsed following\nthe rules described on their respective IANA provisional registration documents.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe actual list of supported connection parameters can vary depending on each connection backend so\nit is recommended to refer to their specific documentation or implementation for details.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ePredis can aggregate multiple connections when providing an array of connection parameters and the\nappropriate option to instruct the client about how to aggregate them (clustering, replication or a\ncustom aggregation logic). Named arrays and URI strings can be mixed when providing configurations\nfor each node:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-php notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$client = new Predis\\Client([\n 'tcp://10.0.0.1?alias=first-node', ['host' =\u0026gt; '10.0.0.2', 'alias' =\u0026gt; 'second-node'],\n], [\n 'cluster' =\u0026gt; 'predis',\n]);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eClient\u003c/span\u003e([\n \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp://10.0.0.1?alias=first-node\u003c/span\u003e'\u003c/span\u003e, [\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ehost\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003e10.0.0.2\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ealias\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003esecond-node\u003c/span\u003e'\u003c/span\u003e],\n], [\n \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ecluster\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003epredis\u003c/span\u003e'\u003c/span\u003e,\n]);\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSee the \u003ca href=\"#aggregate-connections\"\u003eaggregate connections\u003c/a\u003e section of this document for more details.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eConnections to Redis are lazy meaning that the client connects to a server only if and when needed.\nWhile it is recommended to let the client do its own stuff under the hood, there may be times when\nit is still desired to have control of when the connection is opened or closed: this can easily be\nachieved by invoking \u003ccode\u003e$client-\u0026gt;connect()\u003c/code\u003e and \u003ccode\u003e$client-\u0026gt;disconnect()\u003c/code\u003e. Please note that the effect\nof these methods on aggregate connections may differ depending on each specific implementation.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eClient configuration\u003c/h3\u003e\u003ca id=\"user-content-client-configuration\" class=\"anchor\" aria-label=\"Permalink: Client configuration\" href=\"#client-configuration\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eMany aspects and behaviors of the client can be configured by passing specific client options to the\nsecond argument of \u003ccode\u003ePredis\\Client::__construct()\u003c/code\u003e:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-php notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$client = new Predis\\Client($parameters, ['prefix' =\u0026gt; 'sample:']);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eClient\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eparameters\u003c/span\u003e, [\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003eprefix\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003esample:\u003c/span\u003e'\u003c/span\u003e]);\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eOptions are managed using a mini DI-alike container and their values can be lazily initialized only\nwhen needed. The client options supported by default in Predis are:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003eprefix\u003c/code\u003e: prefix string applied to every key found in commands.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eexceptions\u003c/code\u003e: whether the client should throw or return responses upon Redis errors.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003econnections\u003c/code\u003e: list of connection backends or a connection factory instance.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003ecluster\u003c/code\u003e: specifies a cluster backend (\u003ccode\u003epredis\u003c/code\u003e, \u003ccode\u003eredis\u003c/code\u003e or callable).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003ereplication\u003c/code\u003e: specifies a replication backend (\u003ccode\u003epredis\u003c/code\u003e, \u003ccode\u003esentinel\u003c/code\u003e or callable).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eaggregate\u003c/code\u003e: configures the client with a custom aggregate connection (callable).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eparameters\u003c/code\u003e: list of default connection parameters for aggregate connections.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003ecommands\u003c/code\u003e: specifies a command factory instance to use through the library.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eUsers can also provide custom options with values or callable objects (for lazy initialization) that\nare stored in the options container for later use through the library.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAggregate connections\u003c/h3\u003e\u003ca id=\"user-content-aggregate-connections\" class=\"anchor\" aria-label=\"Permalink: Aggregate connections\" href=\"#aggregate-connections\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAggregate connections are the foundation upon which Predis implements clustering and replication and\nthey are used to group multiple connections to single Redis nodes and hide the specific logic needed\nto handle them properly depending on the context. Aggregate connections usually require an array of\nconnection parameters along with the appropriate client option when creating a new client instance.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCluster\u003c/h4\u003e\u003ca id=\"user-content-cluster\" class=\"anchor\" aria-label=\"Permalink: Cluster\" href=\"#cluster\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ePredis can be configured to work in clustering mode with a traditional client-side sharding approach\nto create a cluster of independent nodes and distribute the keyspace among them. This approach needs\nsome sort of external health monitoring of nodes and requires the keyspace to be rebalanced manually\nwhen nodes are added or removed:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-php notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$parameters = ['tcp://10.0.0.1', 'tcp://10.0.0.2', 'tcp://10.0.0.3'];\n$options = ['cluster' =\u0026gt; 'predis'];\n\n$client = new Predis\\Client($parameters);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eparameters\u003c/span\u003e = [\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp://10.0.0.1\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp://10.0.0.2\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp://10.0.0.3\u003c/span\u003e'\u003c/span\u003e];\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eoptions\u003c/span\u003e = [\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ecluster\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003epredis\u003c/span\u003e'\u003c/span\u003e];\n\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eClient\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eparameters\u003c/span\u003e);\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAlong with Redis 3.0, a new supervised and coordinated type of clustering was introduced in the form\nof \u003ca href=\"http://redis.io/topics/cluster-tutorial\" rel=\"nofollow\"\u003eredis-cluster\u003c/a\u003e. This kind of approach uses a different\nalgorithm to distribute the keyspaces, with Redis nodes coordinating themselves by communicating via\na gossip protocol to handle health status, rebalancing, nodes discovery and request redirection. In\norder to connect to a cluster managed by redis-cluster, the client requires a list of its nodes (not\nnecessarily complete since it will automatically discover new nodes if necessary) and the \u003ccode\u003ecluster\u003c/code\u003e\nclient options set to \u003ccode\u003eredis\u003c/code\u003e:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-php notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$parameters = ['tcp://10.0.0.1', 'tcp://10.0.0.2', 'tcp://10.0.0.3'];\n$options = ['cluster' =\u0026gt; 'redis'];\n\n$client = new Predis\\Client($parameters, $options);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eparameters\u003c/span\u003e = [\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp://10.0.0.1\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp://10.0.0.2\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp://10.0.0.3\u003c/span\u003e'\u003c/span\u003e];\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eoptions\u003c/span\u003e = [\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ecluster\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003eredis\u003c/span\u003e'\u003c/span\u003e];\n\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eClient\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eparameters\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eoptions\u003c/span\u003e);\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eReplication\u003c/h4\u003e\u003ca id=\"user-content-replication\" class=\"anchor\" aria-label=\"Permalink: Replication\" href=\"#replication\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe client can be configured to operate in a single master / multiple slaves setup to provide better\nservice availability. When using replication, Predis recognizes read-only commands and sends them to\na random slave in order to provide some sort of load-balancing and switches to the master as soon as\nit detects a command that performs any kind of operation that would end up modifying the keyspace or\nthe value of a key. Instead of raising a connection error when a slave fails, the client attempts to\nfall back to a different slave among the ones provided in the configuration.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe basic configuration needed to use the client in replication mode requires one Redis server to be\nidentified as the master (this can be done via connection parameters by setting the \u003ccode\u003erole\u003c/code\u003e parameter\nto \u003ccode\u003emaster\u003c/code\u003e) and one or more slaves (in this case setting \u003ccode\u003erole\u003c/code\u003e to \u003ccode\u003eslave\u003c/code\u003e for slaves is optional):\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-php notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$parameters = ['tcp://10.0.0.1?role=master', 'tcp://10.0.0.2', 'tcp://10.0.0.3'];\n$options = ['replication' =\u0026gt; 'predis'];\n\n$client = new Predis\\Client($parameters, $options);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eparameters\u003c/span\u003e = [\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp://10.0.0.1?role=master\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp://10.0.0.2\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp://10.0.0.3\u003c/span\u003e'\u003c/span\u003e];\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eoptions\u003c/span\u003e = [\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ereplication\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003epredis\u003c/span\u003e'\u003c/span\u003e];\n\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eClient\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eparameters\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eoptions\u003c/span\u003e);\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe above configuration has a static list of servers and relies entirely on the client's logic, but\nit is possible to rely on \u003ca href=\"http://redis.io/topics/sentinel\" rel=\"nofollow\"\u003e\u003ccode\u003eredis-sentinel\u003c/code\u003e\u003c/a\u003e for a more robust HA\nenvironment with sentinel servers acting as a source of authority for clients for service discovery.\nThe minimum configuration required by the client to work with redis-sentinel is a list of connection\nparameters pointing to a bunch of sentinel instances, the \u003ccode\u003ereplication\u003c/code\u003e option set to \u003ccode\u003esentinel\u003c/code\u003e and\nthe \u003ccode\u003eservice\u003c/code\u003e option set to the name of the service:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-php notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$sentinels = ['tcp://10.0.0.1', 'tcp://10.0.0.2', 'tcp://10.0.0.3'];\n$options = ['replication' =\u0026gt; 'sentinel', 'service' =\u0026gt; 'mymaster'];\n\n$client = new Predis\\Client($sentinels, $options);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003esentinels\u003c/span\u003e = [\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp://10.0.0.1\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp://10.0.0.2\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp://10.0.0.3\u003c/span\u003e'\u003c/span\u003e];\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eoptions\u003c/span\u003e = [\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ereplication\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003esentinel\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003eservice\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003emymaster\u003c/span\u003e'\u003c/span\u003e];\n\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eClient\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003esentinels\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eoptions\u003c/span\u003e);\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf the master and slave nodes are configured to require an authentication from clients, a password\nmust be provided via the global \u003ccode\u003eparameters\u003c/code\u003e client option. This option can also be used to specify\na different database index. The client options array would then look like this:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-php notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$options = [\n 'replication' =\u0026gt; 'sentinel',\n 'service' =\u0026gt; 'mymaster',\n 'parameters' =\u0026gt; [\n 'password' =\u0026gt; $secretpassword,\n 'database' =\u0026gt; 10,\n ],\n];\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eoptions\u003c/span\u003e = [\n \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ereplication\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003esentinel\u003c/span\u003e'\u003c/span\u003e,\n \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003eservice\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003emymaster\u003c/span\u003e'\u003c/span\u003e,\n \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003eparameters\u003c/span\u003e'\u003c/span\u003e =\u0026gt; [\n \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003epassword\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003esecretpassword\u003c/span\u003e,\n \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003edatabase\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-c1\"\u003e10\u003c/span\u003e,\n ],\n];\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhile Predis is able to distinguish commands performing write and read-only operations, \u003ccode\u003eEVAL\u003c/code\u003e and\n\u003ccode\u003eEVALSHA\u003c/code\u003e represent a corner case in which the client switches to the master node because it cannot\ntell when a Lua script is safe to be executed on slaves. While this is indeed the default behavior,\nwhen certain Lua scripts do not perform write operations it is possible to provide an hint to tell\nthe client to stick with slaves for their execution:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-php notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$parameters = ['tcp://10.0.0.1?role=master', 'tcp://10.0.0.2', 'tcp://10.0.0.3'];\n$options = ['replication' =\u0026gt; function () {\n // Set scripts that won't trigger a switch from a slave to the master node.\n $strategy = new Predis\\Replication\\ReplicationStrategy();\n $strategy-\u0026gt;setScriptReadOnly($LUA_SCRIPT);\n\n return new Predis\\Connection\\Replication\\MasterSlaveReplication($strategy);\n}];\n\n$client = new Predis\\Client($parameters, $options);\n$client-\u0026gt;eval($LUA_SCRIPT, 0); // Sticks to slave using `eval`...\n$client-\u0026gt;evalsha(sha1($LUA_SCRIPT), 0); // ... and `evalsha`, too.\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eparameters\u003c/span\u003e = [\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp://10.0.0.1?role=master\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp://10.0.0.2\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp://10.0.0.3\u003c/span\u003e'\u003c/span\u003e];\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eoptions\u003c/span\u003e = [\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ereplication\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e () {\n \u003cspan class=\"pl-c\"\u003e// Set scripts that won't trigger a switch from a slave to the master node.\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003estrategy\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eReplication\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eReplicationStrategy\u003c/span\u003e();\n \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003estrategy\u003c/span\u003e-\u0026gt;\u003cspan class=\"pl-en\"\u003esetScriptReadOnly\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eLUA_SCRIPT\u003c/span\u003e\u003c/span\u003e);\n\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eConnection\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eReplication\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eMasterSlaveReplication\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003estrategy\u003c/span\u003e);\n}];\n\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eClient\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eparameters\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eoptions\u003c/span\u003e);\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e-\u0026gt;\u003cspan class=\"pl-en\"\u003eeval\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eLUA_SCRIPT\u003c/span\u003e\u003c/span\u003e, \u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e); \u003cspan class=\"pl-c\"\u003e// Sticks to slave using `eval`...\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e-\u0026gt;\u003cspan class=\"pl-en\"\u003eevalsha\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003esha1\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eLUA_SCRIPT\u003c/span\u003e\u003c/span\u003e), \u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e); \u003cspan class=\"pl-c\"\u003e// ... and `evalsha`, too.\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ca href=\"/nicolas-grekas/predis/blob/main/examples\"\u003e\u003ccode\u003eexamples\u003c/code\u003e\u003c/a\u003e directory contains a few scripts that demonstrate how the client can be\nconfigured and used to leverage replication in both basic and complex scenarios.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCommand pipelines\u003c/h3\u003e\u003ca id=\"user-content-command-pipelines\" class=\"anchor\" aria-label=\"Permalink: Command pipelines\" href=\"#command-pipelines\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ePipelining can help with performances when many commands need to be sent to a server by reducing the\nlatency introduced by network round-trip timings. Pipelining also works with aggregate connections.\nThe client can execute the pipeline inside a callable block or return a pipeline instance with the\nability to chain commands thanks to its fluent interface:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-php notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// Executes a pipeline inside the given callable block:\n$responses = $client-\u0026gt;pipeline(function ($pipe) {\n for ($i = 0; $i \u0026lt; 1000; $i++) {\n $pipe-\u0026gt;set(\u0026quot;key:$i\u0026quot;, str_pad($i, 4, '0', 0));\n $pipe-\u0026gt;get(\u0026quot;key:$i\u0026quot;);\n }\n});\n\n// Returns a pipeline that can be chained thanks to its fluent interface:\n$responses = $client-\u0026gt;pipeline()-\u0026gt;set('foo', 'bar')-\u0026gt;get('foo')-\u0026gt;execute();\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e// Executes a pipeline inside the given callable block:\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eresponses\u003c/span\u003e = \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e-\u0026gt;\u003cspan class=\"pl-en\"\u003epipeline\u003c/span\u003e(\u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e (\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003epipe\u003c/span\u003e) {\n \u003cspan class=\"pl-k\"\u003efor\u003c/span\u003e (\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003ei\u003c/span\u003e = \u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e; \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003ei\u003c/span\u003e \u0026lt; \u003cspan class=\"pl-c1\"\u003e1000\u003c/span\u003e; \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003ei\u003c/span\u003e++) {\n \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003epipe\u003c/span\u003e-\u0026gt;\u003cspan class=\"pl-en\"\u003eset\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"\u003cspan class=\"pl-s\"\u003ekey:\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003ei\u003c/span\u003e\"\u003c/span\u003e, \u003cspan class=\"pl-en\"\u003estr_pad\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003ei\u003c/span\u003e, \u003cspan class=\"pl-c1\"\u003e4\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003e0\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e));\n \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003epipe\u003c/span\u003e-\u0026gt;\u003cspan class=\"pl-en\"\u003eget\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"\u003cspan class=\"pl-s\"\u003ekey:\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003ei\u003c/span\u003e\"\u003c/span\u003e);\n }\n});\n\n\u003cspan class=\"pl-c\"\u003e// Returns a pipeline that can be chained thanks to its fluent interface:\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eresponses\u003c/span\u003e = \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e-\u0026gt;\u003cspan class=\"pl-en\"\u003epipeline\u003c/span\u003e()-\u0026gt;\u003cspan class=\"pl-en\"\u003eset\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003efoo\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ebar\u003c/span\u003e'\u003c/span\u003e)-\u0026gt;\u003cspan class=\"pl-en\"\u003eget\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003efoo\u003c/span\u003e'\u003c/span\u003e)-\u0026gt;\u003cspan class=\"pl-en\"\u003eexecute\u003c/span\u003e();\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eTransactions\u003c/h3\u003e\u003ca id=\"user-content-transactions\" class=\"anchor\" aria-label=\"Permalink: Transactions\" href=\"#transactions\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe client provides an abstraction for Redis transactions based on \u003ccode\u003eMULTI\u003c/code\u003e and \u003ccode\u003eEXEC\u003c/code\u003e with a similar\ninterface to command pipelines:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-php notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// Executes a transaction inside the given callable block:\n$responses = $client-\u0026gt;transaction(function ($tx) {\n $tx-\u0026gt;set('foo', 'bar');\n $tx-\u0026gt;get('foo');\n});\n\n// Returns a transaction that can be chained thanks to its fluent interface:\n$responses = $client-\u0026gt;transaction()-\u0026gt;set('foo', 'bar')-\u0026gt;get('foo')-\u0026gt;execute();\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e// Executes a transaction inside the given callable block:\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eresponses\u003c/span\u003e = \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e-\u0026gt;\u003cspan class=\"pl-en\"\u003etransaction\u003c/span\u003e(\u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e (\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003etx\u003c/span\u003e) {\n \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003etx\u003c/span\u003e-\u0026gt;\u003cspan class=\"pl-en\"\u003eset\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003efoo\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ebar\u003c/span\u003e'\u003c/span\u003e);\n \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003etx\u003c/span\u003e-\u0026gt;\u003cspan class=\"pl-en\"\u003eget\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003efoo\u003c/span\u003e'\u003c/span\u003e);\n});\n\n\u003cspan class=\"pl-c\"\u003e// Returns a transaction that can be chained thanks to its fluent interface:\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eresponses\u003c/span\u003e = \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e-\u0026gt;\u003cspan class=\"pl-en\"\u003etransaction\u003c/span\u003e()-\u0026gt;\u003cspan class=\"pl-en\"\u003eset\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003efoo\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ebar\u003c/span\u003e'\u003c/span\u003e)-\u0026gt;\u003cspan class=\"pl-en\"\u003eget\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003efoo\u003c/span\u003e'\u003c/span\u003e)-\u0026gt;\u003cspan class=\"pl-en\"\u003eexecute\u003c/span\u003e();\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis abstraction can perform check-and-set operations thanks to \u003ccode\u003eWATCH\u003c/code\u003e and \u003ccode\u003eUNWATCH\u003c/code\u003e and provides\nautomatic retries of transactions aborted by Redis when \u003ccode\u003eWATCH\u003c/code\u003eed keys are touched. For an example\nof a transaction using CAS you can see \u003ca href=\"/nicolas-grekas/predis/blob/main/examples/transaction_using_cas.php\"\u003ethe following example\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAdding new commands\u003c/h3\u003e\u003ca id=\"user-content-adding-new-commands\" class=\"anchor\" aria-label=\"Permalink: Adding new commands\" href=\"#adding-new-commands\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhile we try to update Predis to stay up to date with all the commands available in Redis, you might\nprefer to stick with an old version of the library or provide a different way to filter arguments or\nparse responses for specific commands. To achieve that, Predis provides the ability to implement new\ncommand classes to define or override commands in the default command factory used by the client:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-php notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// Define a new command by extending Predis\\Command\\Command:\nclass BrandNewRedisCommand extends Predis\\Command\\Command\n{\n public function getId()\n {\n return 'NEWCMD';\n }\n}\n\n// Inject your command in the current command factory:\n$client = new Predis\\Client($parameters, [\n 'commands' =\u0026gt; [\n 'newcmd' =\u0026gt; 'BrandNewRedisCommand',\n ],\n]);\n\n$response = $client-\u0026gt;newcmd();\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e// Define a new command by extending Predis\\Command\\Command:\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003eclass\u003c/span\u003e BrandNewRedisCommand \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eCommand\u003c/span\u003e\\Command\n{\n \u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-en\"\u003egetId\u003c/span\u003e()\n {\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003eNEWCMD\u003c/span\u003e'\u003c/span\u003e;\n }\n}\n\n\u003cspan class=\"pl-c\"\u003e// Inject your command in the current command factory:\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eClient\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eparameters\u003c/span\u003e, [\n \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ecommands\u003c/span\u003e'\u003c/span\u003e =\u0026gt; [\n \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003enewcmd\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003eBrandNewRedisCommand\u003c/span\u003e'\u003c/span\u003e,\n ],\n]);\n\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eresponse\u003c/span\u003e = \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e-\u0026gt;\u003cspan class=\"pl-en\"\u003enewcmd\u003c/span\u003e();\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThere is also a method to send raw commands without filtering their arguments or parsing responses.\nUsers must provide the list of arguments for the command as an array, following the signatures as\ndefined by the \u003ca href=\"http://redis.io/commands\" rel=\"nofollow\"\u003eRedis documentation for commands\u003c/a\u003e:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-php notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$response = $client-\u0026gt;executeRaw(['SET', 'foo', 'bar']);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eresponse\u003c/span\u003e = \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e-\u0026gt;\u003cspan class=\"pl-en\"\u003eexecuteRaw\u003c/span\u003e([\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003eSET\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003efoo\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ebar\u003c/span\u003e'\u003c/span\u003e]);\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eScript commands\u003c/h3\u003e\u003ca id=\"user-content-script-commands\" class=\"anchor\" aria-label=\"Permalink: Script commands\" href=\"#script-commands\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhile it is possible to leverage \u003ca href=\"http://redis.io/commands/eval\" rel=\"nofollow\"\u003eLua scripting\u003c/a\u003e on Redis 2.6+ using\ndirectly \u003ca href=\"http://redis.io/commands/eval\" rel=\"nofollow\"\u003e\u003ccode\u003eEVAL\u003c/code\u003e\u003c/a\u003e and \u003ca href=\"http://redis.io/commands/evalsha\" rel=\"nofollow\"\u003e\u003ccode\u003eEVALSHA\u003c/code\u003e\u003c/a\u003e,\nPredis offers script commands as an higher level abstraction built upon them to make things simple.\nScript commands can be registered in the command factory used by the client and are accessible as if\nthey were plain Redis commands, but they define Lua scripts that get transmitted to the server for\nremote execution. Internally they use \u003ca href=\"http://redis.io/commands/evalsha\" rel=\"nofollow\"\u003e\u003ccode\u003eEVALSHA\u003c/code\u003e\u003c/a\u003e by default and\nidentify a script by its SHA1 hash to save bandwidth, but \u003ca href=\"http://redis.io/commands/eval\" rel=\"nofollow\"\u003e\u003ccode\u003eEVAL\u003c/code\u003e\u003c/a\u003e\nis used as a fall back when needed:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-php notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// Define a new script command by extending Predis\\Command\\ScriptCommand:\nclass ListPushRandomValue extends Predis\\Command\\ScriptCommand\n{\n public function getKeysCount()\n {\n return 1;\n }\n\n public function getScript()\n {\n return \u0026lt;\u0026lt;\u0026lt;LUA\nmath.randomseed(ARGV[1])\nlocal rnd = tostring(math.random())\nredis.call('lpush', KEYS[1], rnd)\nreturn rnd\nLUA;\n }\n}\n\n// Inject the script command in the current command factory:\n$client = new Predis\\Client($parameters, [\n 'commands' =\u0026gt; [\n 'lpushrand' =\u0026gt; 'ListPushRandomValue',\n ],\n]);\n\n$response = $client-\u0026gt;lpushrand('random_values', $seed = mt_rand());\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e// Define a new script command by extending Predis\\Command\\ScriptCommand:\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003eclass\u003c/span\u003e ListPushRandomValue \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eCommand\u003c/span\u003e\\ScriptCommand\n{\n \u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-en\"\u003egetKeysCount\u003c/span\u003e()\n {\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e;\n }\n\n \u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-en\"\u003egetScript\u003c/span\u003e()\n {\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\u0026lt;\u0026lt;\u0026lt;LUA\u003cspan class=\"pl-s\"\u003e\u003c/span\u003e\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-s\"\u003emath.randomseed(ARGV[1])\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-s\"\u003elocal rnd = tostring(math.random())\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-s\"\u003eredis.call('lpush', KEYS[1], rnd)\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-s\"\u003ereturn rnd\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003eLUA\u003c/span\u003e;\n }\n}\n\n\u003cspan class=\"pl-c\"\u003e// Inject the script command in the current command factory:\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eClient\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eparameters\u003c/span\u003e, [\n \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ecommands\u003c/span\u003e'\u003c/span\u003e =\u0026gt; [\n \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003elpushrand\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003eListPushRandomValue\u003c/span\u003e'\u003c/span\u003e,\n ],\n]);\n\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eresponse\u003c/span\u003e = \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e-\u0026gt;\u003cspan class=\"pl-en\"\u003elpushrand\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003erandom_values\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eseed\u003c/span\u003e = \u003cspan class=\"pl-en\"\u003emt_rand\u003c/span\u003e());\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCustomizable connection backends\u003c/h3\u003e\u003ca id=\"user-content-customizable-connection-backends\" class=\"anchor\" aria-label=\"Permalink: Customizable connection backends\" href=\"#customizable-connection-backends\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ePredis can use different connection backends to connect to Redis. Two of them leverage a third party\nextension such as \u003ca href=\"https://github.com/nrk/phpiredis\"\u003ephpiredis\u003c/a\u003e resulting in major performance gains\nespecially when dealing with big multibulk responses. While one is based on PHP streams, the other\nis based on socket resources provided by \u003ccode\u003eext-socket\u003c/code\u003e. Both support TCP/IP and UNIX domain sockets:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-php notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$client = new Predis\\Client('tcp://127.0.0.1', [\n 'connections' =\u0026gt; [\n 'tcp' =\u0026gt; 'Predis\\Connection\\PhpiredisStreamConnection', // PHP stream resources\n 'unix' =\u0026gt; 'Predis\\Connection\\PhpiredisSocketConnection', // ext-socket resources\n ],\n]);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eClient\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp://127.0.0.1\u003c/span\u003e'\u003c/span\u003e, [\n \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003econnections\u003c/span\u003e'\u003c/span\u003e =\u0026gt; [\n \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ePredis\\Connection\\PhpiredisStreamConnection\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-c\"\u003e// PHP stream resources\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003eunix\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ePredis\\Connection\\PhpiredisSocketConnection\u003c/span\u003e'\u003c/span\u003e, \u003cspan class=\"pl-c\"\u003e// ext-socket resources\u003c/span\u003e\n ],\n]);\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe client can also be configured to rely on a \u003ca href=\"https://github.com/nrk/phpiredis\"\u003ephpiredis\u003c/a\u003e-backend\nby specifying a descriptive string for the \u003ccode\u003econnections\u003c/code\u003e client option. Supported string values are:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003ephpiredis-stream\u003c/code\u003e maps \u003ccode\u003etcp\u003c/code\u003e, \u003ccode\u003eredis\u003c/code\u003e and \u003ccode\u003eunix\u003c/code\u003e to \u003ccode\u003ePredis\\Connection\\PhpiredisStreamConnection\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003ephpiredis-socket\u003c/code\u003e maps \u003ccode\u003etcp\u003c/code\u003e, \u003ccode\u003eredis\u003c/code\u003e and \u003ccode\u003eunix\u003c/code\u003e to \u003ccode\u003ePredis\\Connection\\PhpiredisSocketConnection\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003ephpiredis\u003c/code\u003e is simply an alias of \u003ccode\u003ephpiredis-stream\u003c/code\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"highlight highlight-text-html-php notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$client = new Predis\\Client('tcp://127.0.0.1', ['connections' =\u0026gt; 'phpiredis']);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eClient\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp://127.0.0.1\u003c/span\u003e'\u003c/span\u003e, [\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003econnections\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003ephpiredis\u003c/span\u003e'\u003c/span\u003e]);\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eDevelopers can create their own connection classes to support whole new network backends, extend\nexisting classes or provide completely different implementations. Connection classes must implement\n\u003ccode\u003ePredis\\Connection\\NodeConnectionInterface\u003c/code\u003e or extend \u003ccode\u003ePredis\\Connection\\AbstractConnection\u003c/code\u003e:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-php notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"class MyConnectionClass implements Predis\\Connection\\NodeConnectionInterface\n{\n // Implementation goes here...\n}\n\n// Use MyConnectionClass to handle connections for the `tcp` scheme:\n$client = new Predis\\Client('tcp://127.0.0.1', [\n 'connections' =\u0026gt; ['tcp' =\u0026gt; 'MyConnectionClass'],\n]);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eclass\u003c/span\u003e MyConnectionClass \u003cspan class=\"pl-k\"\u003eimplements\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eConnection\u003c/span\u003e\\NodeConnectionInterface\n{\n \u003cspan class=\"pl-c\"\u003e// Implementation goes here...\u003c/span\u003e\n}\n\n\u003cspan class=\"pl-c\"\u003e// Use MyConnectionClass to handle connections for the `tcp` scheme:\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003e$\u003c/span\u003eclient\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePredis\u003c/span\u003e\\\u003cspan class=\"pl-v\"\u003eClient\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp://127.0.0.1\u003c/span\u003e'\u003c/span\u003e, [\n \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003econnections\u003c/span\u003e'\u003c/span\u003e =\u0026gt; [\u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003etcp\u003c/span\u003e'\u003c/span\u003e =\u0026gt; \u003cspan class=\"pl-s\"\u003e'\u003cspan class=\"pl-s\"\u003eMyConnectionClass\u003c/span\u003e'\u003c/span\u003e],\n]);\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFor a more in-depth insight on how to create new connection backends you can refer to the actual\nimplementation of the standard connection classes available in the \u003ccode\u003ePredis\\Connection\u003c/code\u003e namespace.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDevelopment\u003c/h2\u003e\u003ca id=\"user-content-development\" class=\"anchor\" aria-label=\"Permalink: Development\" href=\"#development\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eReporting bugs and contributing code\u003c/h3\u003e\u003ca id=\"user-content-reporting-bugs-and-contributing-code\" class=\"anchor\" aria-label=\"Permalink: Reporting bugs and contributing code\" href=\"#reporting-bugs-and-contributing-code\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eContributions to Predis are highly appreciated either in the form of pull requests for new features,\nbug fixes, or just bug reports. We only ask you to adhere to a \u003ca href=\"/nicolas-grekas/predis/blob/main/CONTRIBUTING.md\"\u003ebasic set of rules\u003c/a\u003e\nbefore submitting your changes or filing bugs on the issue tracker to make it easier for everyone to\nstay consistent while working on the project.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eTest suite\u003c/h3\u003e\u003ca id=\"user-content-test-suite\" class=\"anchor\" aria-label=\"Permalink: Test suite\" href=\"#test-suite\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eATTENTION\u003c/strong\u003e: Do not ever run the test suite shipped with Predis against instances of Redis running\nin production environments or containing data you are interested in!\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ePredis has a comprehensive test suite covering every aspect of the library and that can optionally\nperform integration tests against a running instance of Redis (required \u0026gt;= 2.4.0 in order to verify\nthe correct behavior of the implementation of each command. Integration tests for unsupported Redis\ncommands are automatically skipped. If you do not have Redis up and running, integration tests can\nbe disabled. See \u003ca href=\"/nicolas-grekas/predis/blob/main/tests/README.md\"\u003ethe tests README\u003c/a\u003e for more details about testing this library.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ePredis uses GitHub Actions for continuous integration and the history for past and current builds can be\nfound \u003ca href=\"https://github.com/predis/predis/actions\"\u003eon its actions page\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOther\u003c/h2\u003e\u003ca id=\"user-content-other\" class=\"anchor\" aria-label=\"Permalink: Other\" href=\"#other\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eProject related links\u003c/h3\u003e\u003ca id=\"user-content-project-related-links\" class=\"anchor\" aria-label=\"Permalink: Project related links\" href=\"#project-related-links\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/predis/predis\"\u003eSource code\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/predis/predis/wiki\"\u003eWiki\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/predis/predis/issues\"\u003eIssue tracker\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAuthor\u003c/h3\u003e\u003ca id=\"user-content-author\" class=\"anchor\" aria-label=\"Permalink: Author\" href=\"#author\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"mailto:suppakilla@gmail.com\"\u003eDaniele Alessandri\u003c/a\u003e (\u003ca href=\"http://twitter.com/JoL1hAHN\" rel=\"nofollow\"\u003etwitter\u003c/a\u003e)\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://till.im\" rel=\"nofollow\"\u003eTill Krüss\u003c/a\u003e (\u003ca href=\"http://twitter.com/tillkruss\" rel=\"nofollow\"\u003eTwitter\u003c/a\u003e)\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLicense\u003c/h3\u003e\u003ca id=\"user-content-license\" class=\"anchor\" aria-label=\"Permalink: License\" href=\"#license\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe code for Predis is distributed under the terms of the MIT license (see \u003ca href=\"/nicolas-grekas/predis/blob/main/LICENSE\"\u003eLICENSE\u003c/a\u003e).\u003c/p\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":1,"text":"Predis","anchor":"predis","htmlText":"Predis"},{"level":2,"text":"Main features","anchor":"main-features","htmlText":"Main features"},{"level":2,"text":"How to install and use Predis","anchor":"how-to-install-and-use-predis","htmlText":"How to install and use Predis"},{"level":3,"text":"Loading the library","anchor":"loading-the-library","htmlText":"Loading the library"},{"level":3,"text":"Connecting to Redis","anchor":"connecting-to-redis","htmlText":"Connecting to Redis"},{"level":3,"text":"Client configuration","anchor":"client-configuration","htmlText":"Client configuration"},{"level":3,"text":"Aggregate connections","anchor":"aggregate-connections","htmlText":"Aggregate connections"},{"level":4,"text":"Cluster","anchor":"cluster","htmlText":"Cluster"},{"level":4,"text":"Replication","anchor":"replication","htmlText":"Replication"},{"level":3,"text":"Command pipelines","anchor":"command-pipelines","htmlText":"Command pipelines"},{"level":3,"text":"Transactions","anchor":"transactions","htmlText":"Transactions"},{"level":3,"text":"Adding new commands","anchor":"adding-new-commands","htmlText":"Adding new commands"},{"level":3,"text":"Script commands","anchor":"script-commands","htmlText":"Script commands"},{"level":3,"text":"Customizable connection backends","anchor":"customizable-connection-backends","htmlText":"Customizable connection backends"},{"level":2,"text":"Development","anchor":"development","htmlText":"Development"},{"level":3,"text":"Reporting bugs and contributing code","anchor":"reporting-bugs-and-contributing-code","htmlText":"Reporting bugs and contributing code"},{"level":3,"text":"Test suite","anchor":"test-suite","htmlText":"Test suite"},{"level":2,"text":"Other","anchor":"other","htmlText":"Other"},{"level":3,"text":"Project related links","anchor":"project-related-links","htmlText":"Project related links"},{"level":3,"text":"Author","anchor":"author","htmlText":"Author"},{"level":3,"text":"License","anchor":"license","htmlText":"License"}],"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2Fnicolas-grekas%2Fpredis"}},{"displayName":"CODE_OF_CONDUCT.md","repoName":"predis","refName":"main","path":".github/CODE_OF_CONDUCT.md","preferredFileType":"code_of_conduct","tabName":"Code of 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data-canonical-src="https://img.shields.io/github/workflow/status/predis/predis/Tests/main?style=flat-square" style="max-width: 100%;"></a></p> <p dir="auto">A flexible and feature-complete <a href="http://redis.io" rel="nofollow">Redis</a> client for PHP 7.2 and newer.</p> <p dir="auto"><strong>ATTENTION:</strong> you are on the README file of an unstable branch of Predis specifically meant for the development of future releases. This means that the code on this branch is potentially unstable, and breaking change may happen without any prior notice. Do not use it in production environments or use it at your own risk!</p> <p dir="auto">Predis does not require any additional C extension by default, but it can be optionally paired with <a href="https://github.com/nrk/phpiredis">phpiredis</a> to lower the overhead of the serialization and parsing of the <a href="http://redis.io/topics/protocol" rel="nofollow">Redis RESP Protocol</a>.</p> <p dir="auto">More details about this project can be found on the <a href="/nicolas-grekas/predis/blob/main/FAQ.md">frequently asked questions</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Main features</h2><a id="user-content-main-features" class="anchor" aria-label="Permalink: Main features" href="#main-features"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>Support for Redis from <strong>2.0</strong> to <strong>3.2</strong>.</li> <li>Support for clustering using client-side sharding and pluggable keyspace distributors.</li> <li>Support for <a href="http://redis.io/topics/cluster-tutorial" rel="nofollow">redis-cluster</a> (Redis >= 3.0).</li> <li>Support for master-slave replication setups and <a href="http://redis.io/topics/sentinel" rel="nofollow">redis-sentinel</a>.</li> <li>Transparent key prefixing of keys using a customizable prefix strategy.</li> <li>Command pipelining on both single nodes and clusters (client-side sharding only).</li> <li>Abstraction for Redis transactions (Redis >= 2.0) and CAS operations (Redis >= 2.2).</li> <li>Abstraction for Lua scripting (Redis >= 2.6) and automatic switching between <code>EVALSHA</code> or <code>EVAL</code>.</li> <li>Abstraction for <code>SCAN</code>, <code>SSCAN</code>, <code>ZSCAN</code> and <code>HSCAN</code> (Redis >= 2.8) based on PHP iterators.</li> <li>Connections are established lazily by the client upon the first command and can be persisted.</li> <li>Connections can be established via TCP/IP (also TLS/SSL-encrypted) or UNIX domain sockets.</li> <li>Support for <a href="http://webd.is" rel="nofollow">Webdis</a> (requires both <code>ext-curl</code> and <code>ext-phpiredis</code>).</li> <li>Support for custom connection classes for providing different network or protocol backends.</li> <li>Flexible system for defining custom commands and override the default ones.</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">How to <em>install</em> and use Predis</h2><a id="user-content-how-to-install-and-use-predis" class="anchor" aria-label="Permalink: How to install and use Predis" href="#how-to-install-and-use-predis"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This library can be found on <a href="http://packagist.org/packages/predis/predis" rel="nofollow">Packagist</a> for an easier management of projects dependencies using <a href="http://packagist.org/about-composer" rel="nofollow">Composer</a>. Compressed archives of each release are <a href="https://github.com/predis/predis/releases">available on GitHub</a>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Loading the library</h3><a id="user-content-loading-the-library" class="anchor" aria-label="Permalink: Loading the library" href="#loading-the-library"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Predis relies on the autoloading features of PHP to load its files when needed and complies with the <a href="https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-4-autoloader.md">PSR-4 standard</a>. Autoloading is handled automatically when dependencies are managed through Composer, but it is also possible to leverage its own autoloader in projects or scripts lacking any autoload facility:</p> <div class="highlight highlight-text-html-php notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="// Prepend a base path if Predis is not available in your "include_path". require 'Predis/Autoloader.php'; Predis\Autoloader::register();"><pre><span class="pl-c">// Prepend a base path if Predis is not available in your "include_path".</span> <span class="pl-k">require</span> <span class="pl-s">'<span class="pl-s">Predis/Autoloader.php</span>'</span>; <span class="pl-v">Predis</span>\Autoloader::<span class="pl-en">register</span>();</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Connecting to Redis</h3><a id="user-content-connecting-to-redis" class="anchor" aria-label="Permalink: Connecting to Redis" href="#connecting-to-redis"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">When creating a client instance without passing any connection parameter, Predis assumes <code>127.0.0.1</code> and <code>6379</code> as default host and port. The default timeout for the <code>connect()</code> operation is 5 seconds:</p> <div class="highlight highlight-text-html-php notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$client = new Predis\Client(); $client->set('foo', 'bar'); $value = $client->get('foo');"><pre><span class="pl-s1"><span class="pl-c1">$</span>client</span> = <span class="pl-k">new</span> <span class="pl-v">Predis</span>\<span class="pl-v">Client</span>(); <span class="pl-s1"><span class="pl-c1">$</span>client</span>-><span class="pl-en">set</span>(<span class="pl-s">'<span class="pl-s">foo</span>'</span>, <span class="pl-s">'<span class="pl-s">bar</span>'</span>); <span class="pl-s1"><span class="pl-c1">$</span>value</span> = <span class="pl-s1"><span class="pl-c1">$</span>client</span>-><span class="pl-en">get</span>(<span class="pl-s">'<span class="pl-s">foo</span>'</span>);</pre></div> <p dir="auto">Connection parameters can be supplied either in the form of URI strings or named arrays. The latter is the preferred way to supply parameters, but URI strings can be useful when parameters are read from non-structured or partially-structured sources:</p> <div class="highlight highlight-text-html-php notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="// Parameters passed using a named array: $client = new Predis\Client([ 'scheme' => 'tcp', 'host' => '10.0.0.1', 'port' => 6379, ]); // Same set of parameters, passed using an URI string: $client = new Predis\Client('tcp://10.0.0.1:6379');"><pre><span class="pl-c">// Parameters passed using a named array:</span> <span class="pl-s1"><span class="pl-c1">$</span>client</span> = <span class="pl-k">new</span> <span class="pl-v">Predis</span>\<span class="pl-v">Client</span>([ <span class="pl-s">'<span class="pl-s">scheme</span>'</span> => <span class="pl-s">'<span class="pl-s">tcp</span>'</span>, <span class="pl-s">'<span class="pl-s">host</span>'</span> => <span class="pl-s">'<span class="pl-s">10.0.0.1</span>'</span>, <span class="pl-s">'<span class="pl-s">port</span>'</span> => <span class="pl-c1">6379</span>, ]); <span class="pl-c">// Same set of parameters, passed using an URI string:</span> <span class="pl-s1"><span class="pl-c1">$</span>client</span> = <span class="pl-k">new</span> <span class="pl-v">Predis</span>\<span class="pl-v">Client</span>(<span class="pl-s">'<span class="pl-s">tcp://10.0.0.1:6379</span>'</span>);</pre></div> <p dir="auto">Password protected servers can be accessed by adding <code>password</code> to the parameters set. When ACLs are enabled on Redis >= 6.0, both <code>username</code> and <code>password</code> are required for user authentication.</p> <p dir="auto">It is also possible to connect to local instances of Redis using UNIX domain sockets, in this case the parameters must use the <code>unix</code> scheme and specify a path for the socket file:</p> <div class="highlight highlight-text-html-php notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$client = new Predis\Client(['scheme' => 'unix', 'path' => '/path/to/redis.sock']); $client = new Predis\Client('unix:/path/to/redis.sock');"><pre><span class="pl-s1"><span class="pl-c1">$</span>client</span> = <span class="pl-k">new</span> <span class="pl-v">Predis</span>\<span class="pl-v">Client</span>([<span class="pl-s">'<span class="pl-s">scheme</span>'</span> => <span class="pl-s">'<span class="pl-s">unix</span>'</span>, <span class="pl-s">'<span class="pl-s">path</span>'</span> => <span class="pl-s">'<span class="pl-s">/path/to/redis.sock</span>'</span>]); <span class="pl-s1"><span class="pl-c1">$</span>client</span> = <span class="pl-k">new</span> <span class="pl-v">Predis</span>\<span class="pl-v">Client</span>(<span class="pl-s">'<span class="pl-s">unix:/path/to/redis.sock</span>'</span>);</pre></div> <p dir="auto">The client can leverage TLS/SSL encryption to connect to secured remote Redis instances without the need to configure an SSL proxy like stunnel. This can be useful when connecting to nodes running on various cloud hosting providers. Encryption can be enabled with using the <code>tls</code> scheme and an array of suitable <a href="http://php.net/manual/context.ssl.php" rel="nofollow">options</a> passed via the <code>ssl</code> parameter:</p> <div class="highlight highlight-text-html-php notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="// Named array of connection parameters: $client = new Predis\Client([ 'scheme' => 'tls', 'ssl' => ['cafile' => 'private.pem', 'verify_peer' => true], ]); // Same set of parameters, but using an URI string: $client = new Predis\Client('tls://127.0.0.1?ssl[cafile]=private.pem&ssl[verify_peer]=1');"><pre><span class="pl-c">// Named array of connection parameters:</span> <span class="pl-s1"><span class="pl-c1">$</span>client</span> = <span class="pl-k">new</span> <span class="pl-v">Predis</span>\<span class="pl-v">Client</span>([ <span class="pl-s">'<span class="pl-s">scheme</span>'</span> => <span class="pl-s">'<span class="pl-s">tls</span>'</span>, <span class="pl-s">'<span class="pl-s">ssl</span>'</span> => [<span class="pl-s">'<span class="pl-s">cafile</span>'</span> => <span class="pl-s">'<span class="pl-s">private.pem</span>'</span>, <span class="pl-s">'<span class="pl-s">verify_peer</span>'</span> => <span class="pl-c1">true</span>], ]); <span class="pl-c">// Same set of parameters, but using an URI string:</span> <span class="pl-s1"><span class="pl-c1">$</span>client</span> = <span class="pl-k">new</span> <span class="pl-v">Predis</span>\<span class="pl-v">Client</span>(<span class="pl-s">'<span class="pl-s">tls://127.0.0.1?ssl[cafile]=private.pem&ssl[verify_peer]=1</span>'</span>);</pre></div> <p dir="auto">The connection schemes <a href="http://www.iana.org/assignments/uri-schemes/prov/redis" rel="nofollow"><code>redis</code></a> (alias of <code>tcp</code>) and <a href="http://www.iana.org/assignments/uri-schemes/prov/rediss" rel="nofollow"><code>rediss</code></a> (alias of <code>tls</code>) are also supported, with the difference that URI strings containing these schemes are parsed following the rules described on their respective IANA provisional registration documents.</p> <p dir="auto">The actual list of supported connection parameters can vary depending on each connection backend so it is recommended to refer to their specific documentation or implementation for details.</p> <p dir="auto">Predis can aggregate multiple connections when providing an array of connection parameters and the appropriate option to instruct the client about how to aggregate them (clustering, replication or a custom aggregation logic). Named arrays and URI strings can be mixed when providing configurations for each node:</p> <div class="highlight highlight-text-html-php notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$client = new Predis\Client([ 'tcp://10.0.0.1?alias=first-node', ['host' => '10.0.0.2', 'alias' => 'second-node'], ], [ 'cluster' => 'predis', ]);"><pre><span class="pl-s1"><span class="pl-c1">$</span>client</span> = <span class="pl-k">new</span> <span class="pl-v">Predis</span>\<span class="pl-v">Client</span>([ <span class="pl-s">'<span class="pl-s">tcp://10.0.0.1?alias=first-node</span>'</span>, [<span class="pl-s">'<span class="pl-s">host</span>'</span> => <span class="pl-s">'<span class="pl-s">10.0.0.2</span>'</span>, <span class="pl-s">'<span class="pl-s">alias</span>'</span> => <span class="pl-s">'<span class="pl-s">second-node</span>'</span>], ], [ <span class="pl-s">'<span class="pl-s">cluster</span>'</span> => <span class="pl-s">'<span class="pl-s">predis</span>'</span>, ]);</pre></div> <p dir="auto">See the <a href="#aggregate-connections">aggregate connections</a> section of this document for more details.</p> <p dir="auto">Connections to Redis are lazy meaning that the client connects to a server only if and when needed. While it is recommended to let the client do its own stuff under the hood, there may be times when it is still desired to have control of when the connection is opened or closed: this can easily be achieved by invoking <code>$client->connect()</code> and <code>$client->disconnect()</code>. Please note that the effect of these methods on aggregate connections may differ depending on each specific implementation.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Client configuration</h3><a id="user-content-client-configuration" class="anchor" aria-label="Permalink: Client configuration" href="#client-configuration"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Many aspects and behaviors of the client can be configured by passing specific client options to the second argument of <code>Predis\Client::__construct()</code>:</p> <div class="highlight highlight-text-html-php notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$client = new Predis\Client($parameters, ['prefix' => 'sample:']);"><pre><span class="pl-s1"><span class="pl-c1">$</span>client</span> = <span class="pl-k">new</span> <span class="pl-v">Predis</span>\<span class="pl-v">Client</span>(<span class="pl-s1"><span class="pl-c1">$</span>parameters</span>, [<span class="pl-s">'<span class="pl-s">prefix</span>'</span> => <span class="pl-s">'<span class="pl-s">sample:</span>'</span>]);</pre></div> <p dir="auto">Options are managed using a mini DI-alike container and their values can be lazily initialized only when needed. The client options supported by default in Predis are:</p> <ul dir="auto"> <li><code>prefix</code>: prefix string applied to every key found in commands.</li> <li><code>exceptions</code>: whether the client should throw or return responses upon Redis errors.</li> <li><code>connections</code>: list of connection backends or a connection factory instance.</li> <li><code>cluster</code>: specifies a cluster backend (<code>predis</code>, <code>redis</code> or callable).</li> <li><code>replication</code>: specifies a replication backend (<code>predis</code>, <code>sentinel</code> or callable).</li> <li><code>aggregate</code>: configures the client with a custom aggregate connection (callable).</li> <li><code>parameters</code>: list of default connection parameters for aggregate connections.</li> <li><code>commands</code>: specifies a command factory instance to use through the library.</li> </ul> <p dir="auto">Users can also provide custom options with values or callable objects (for lazy initialization) that are stored in the options container for later use through the library.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Aggregate connections</h3><a id="user-content-aggregate-connections" class="anchor" aria-label="Permalink: Aggregate connections" href="#aggregate-connections"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Aggregate connections are the foundation upon which Predis implements clustering and replication and they are used to group multiple connections to single Redis nodes and hide the specific logic needed to handle them properly depending on the context. Aggregate connections usually require an array of connection parameters along with the appropriate client option when creating a new client instance.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Cluster</h4><a id="user-content-cluster" class="anchor" aria-label="Permalink: Cluster" href="#cluster"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Predis can be configured to work in clustering mode with a traditional client-side sharding approach to create a cluster of independent nodes and distribute the keyspace among them. This approach needs some sort of external health monitoring of nodes and requires the keyspace to be rebalanced manually when nodes are added or removed:</p> <div class="highlight highlight-text-html-php notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$parameters = ['tcp://10.0.0.1', 'tcp://10.0.0.2', 'tcp://10.0.0.3']; $options = ['cluster' => 'predis']; $client = new Predis\Client($parameters);"><pre><span class="pl-s1"><span class="pl-c1">$</span>parameters</span> = [<span class="pl-s">'<span class="pl-s">tcp://10.0.0.1</span>'</span>, <span class="pl-s">'<span class="pl-s">tcp://10.0.0.2</span>'</span>, <span class="pl-s">'<span class="pl-s">tcp://10.0.0.3</span>'</span>]; <span class="pl-s1"><span class="pl-c1">$</span>options</span> = [<span class="pl-s">'<span class="pl-s">cluster</span>'</span> => <span class="pl-s">'<span class="pl-s">predis</span>'</span>]; <span class="pl-s1"><span class="pl-c1">$</span>client</span> = <span class="pl-k">new</span> <span class="pl-v">Predis</span>\<span class="pl-v">Client</span>(<span class="pl-s1"><span class="pl-c1">$</span>parameters</span>);</pre></div> <p dir="auto">Along with Redis 3.0, a new supervised and coordinated type of clustering was introduced in the form of <a href="http://redis.io/topics/cluster-tutorial" rel="nofollow">redis-cluster</a>. This kind of approach uses a different algorithm to distribute the keyspaces, with Redis nodes coordinating themselves by communicating via a gossip protocol to handle health status, rebalancing, nodes discovery and request redirection. In order to connect to a cluster managed by redis-cluster, the client requires a list of its nodes (not necessarily complete since it will automatically discover new nodes if necessary) and the <code>cluster</code> client options set to <code>redis</code>:</p> <div class="highlight highlight-text-html-php notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$parameters = ['tcp://10.0.0.1', 'tcp://10.0.0.2', 'tcp://10.0.0.3']; $options = ['cluster' => 'redis']; $client = new Predis\Client($parameters, $options);"><pre><span class="pl-s1"><span class="pl-c1">$</span>parameters</span> = [<span class="pl-s">'<span class="pl-s">tcp://10.0.0.1</span>'</span>, <span class="pl-s">'<span class="pl-s">tcp://10.0.0.2</span>'</span>, <span class="pl-s">'<span class="pl-s">tcp://10.0.0.3</span>'</span>]; <span class="pl-s1"><span class="pl-c1">$</span>options</span> = [<span class="pl-s">'<span class="pl-s">cluster</span>'</span> => <span class="pl-s">'<span class="pl-s">redis</span>'</span>]; <span class="pl-s1"><span class="pl-c1">$</span>client</span> = <span class="pl-k">new</span> <span class="pl-v">Predis</span>\<span class="pl-v">Client</span>(<span class="pl-s1"><span class="pl-c1">$</span>parameters</span>, <span class="pl-s1"><span class="pl-c1">$</span>options</span>);</pre></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Replication</h4><a id="user-content-replication" class="anchor" aria-label="Permalink: Replication" href="#replication"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The client can be configured to operate in a single master / multiple slaves setup to provide better service availability. When using replication, Predis recognizes read-only commands and sends them to a random slave in order to provide some sort of load-balancing and switches to the master as soon as it detects a command that performs any kind of operation that would end up modifying the keyspace or the value of a key. Instead of raising a connection error when a slave fails, the client attempts to fall back to a different slave among the ones provided in the configuration.</p> <p dir="auto">The basic configuration needed to use the client in replication mode requires one Redis server to be identified as the master (this can be done via connection parameters by setting the <code>role</code> parameter to <code>master</code>) and one or more slaves (in this case setting <code>role</code> to <code>slave</code> for slaves is optional):</p> <div class="highlight highlight-text-html-php notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$parameters = ['tcp://10.0.0.1?role=master', 'tcp://10.0.0.2', 'tcp://10.0.0.3']; $options = ['replication' => 'predis']; $client = new Predis\Client($parameters, $options);"><pre><span class="pl-s1"><span class="pl-c1">$</span>parameters</span> = [<span class="pl-s">'<span class="pl-s">tcp://10.0.0.1?role=master</span>'</span>, <span class="pl-s">'<span class="pl-s">tcp://10.0.0.2</span>'</span>, <span class="pl-s">'<span class="pl-s">tcp://10.0.0.3</span>'</span>]; <span class="pl-s1"><span class="pl-c1">$</span>options</span> = [<span class="pl-s">'<span class="pl-s">replication</span>'</span> => <span class="pl-s">'<span class="pl-s">predis</span>'</span>]; <span class="pl-s1"><span class="pl-c1">$</span>client</span> = <span class="pl-k">new</span> <span class="pl-v">Predis</span>\<span class="pl-v">Client</span>(<span class="pl-s1"><span class="pl-c1">$</span>parameters</span>, <span class="pl-s1"><span class="pl-c1">$</span>options</span>);</pre></div> <p dir="auto">The above configuration has a static list of servers and relies entirely on the client's logic, but it is possible to rely on <a href="http://redis.io/topics/sentinel" rel="nofollow"><code>redis-sentinel</code></a> for a more robust HA environment with sentinel servers acting as a source of authority for clients for service discovery. The minimum configuration required by the client to work with redis-sentinel is a list of connection parameters pointing to a bunch of sentinel instances, the <code>replication</code> option set to <code>sentinel</code> and the <code>service</code> option set to the name of the service:</p> <div class="highlight highlight-text-html-php notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$sentinels = ['tcp://10.0.0.1', 'tcp://10.0.0.2', 'tcp://10.0.0.3']; $options = ['replication' => 'sentinel', 'service' => 'mymaster']; $client = new Predis\Client($sentinels, $options);"><pre><span class="pl-s1"><span class="pl-c1">$</span>sentinels</span> = [<span class="pl-s">'<span class="pl-s">tcp://10.0.0.1</span>'</span>, <span class="pl-s">'<span class="pl-s">tcp://10.0.0.2</span>'</span>, <span class="pl-s">'<span class="pl-s">tcp://10.0.0.3</span>'</span>]; <span class="pl-s1"><span class="pl-c1">$</span>options</span> = [<span class="pl-s">'<span class="pl-s">replication</span>'</span> => <span class="pl-s">'<span class="pl-s">sentinel</span>'</span>, <span class="pl-s">'<span class="pl-s">service</span>'</span> => <span class="pl-s">'<span class="pl-s">mymaster</span>'</span>]; <span class="pl-s1"><span class="pl-c1">$</span>client</span> = <span class="pl-k">new</span> <span class="pl-v">Predis</span>\<span class="pl-v">Client</span>(<span class="pl-s1"><span class="pl-c1">$</span>sentinels</span>, <span class="pl-s1"><span class="pl-c1">$</span>options</span>);</pre></div> <p dir="auto">If the master and slave nodes are configured to require an authentication from clients, a password must be provided via the global <code>parameters</code> client option. This option can also be used to specify a different database index. The client options array would then look like this:</p> <div class="highlight highlight-text-html-php notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$options = [ 'replication' => 'sentinel', 'service' => 'mymaster', 'parameters' => [ 'password' => $secretpassword, 'database' => 10, ], ];"><pre><span class="pl-s1"><span class="pl-c1">$</span>options</span> = [ <span class="pl-s">'<span class="pl-s">replication</span>'</span> => <span class="pl-s">'<span class="pl-s">sentinel</span>'</span>, <span class="pl-s">'<span class="pl-s">service</span>'</span> => <span class="pl-s">'<span class="pl-s">mymaster</span>'</span>, <span class="pl-s">'<span class="pl-s">parameters</span>'</span> => [ <span class="pl-s">'<span class="pl-s">password</span>'</span> => <span class="pl-s1"><span class="pl-c1">$</span>secretpassword</span>, <span class="pl-s">'<span class="pl-s">database</span>'</span> => <span class="pl-c1">10</span>, ], ];</pre></div> <p dir="auto">While Predis is able to distinguish commands performing write and read-only operations, <code>EVAL</code> and <code>EVALSHA</code> represent a corner case in which the client switches to the master node because it cannot tell when a Lua script is safe to be executed on slaves. While this is indeed the default behavior, when certain Lua scripts do not perform write operations it is possible to provide an hint to tell the client to stick with slaves for their execution:</p> <div class="highlight highlight-text-html-php notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$parameters = ['tcp://10.0.0.1?role=master', 'tcp://10.0.0.2', 'tcp://10.0.0.3']; $options = ['replication' => function () { // Set scripts that won't trigger a switch from a slave to the master node. $strategy = new Predis\Replication\ReplicationStrategy(); $strategy->setScriptReadOnly($LUA_SCRIPT); return new Predis\Connection\Replication\MasterSlaveReplication($strategy); }]; $client = new Predis\Client($parameters, $options); $client->eval($LUA_SCRIPT, 0); // Sticks to slave using `eval`... $client->evalsha(sha1($LUA_SCRIPT), 0); // ... and `evalsha`, too."><pre><span class="pl-s1"><span class="pl-c1">$</span>parameters</span> = [<span class="pl-s">'<span class="pl-s">tcp://10.0.0.1?role=master</span>'</span>, <span class="pl-s">'<span class="pl-s">tcp://10.0.0.2</span>'</span>, <span class="pl-s">'<span class="pl-s">tcp://10.0.0.3</span>'</span>]; <span class="pl-s1"><span class="pl-c1">$</span>options</span> = [<span class="pl-s">'<span class="pl-s">replication</span>'</span> => <span class="pl-k">function</span> () { <span class="pl-c">// Set scripts that won't trigger a switch from a slave to the master node.</span> <span class="pl-s1"><span class="pl-c1">$</span>strategy</span> = <span class="pl-k">new</span> <span class="pl-v">Predis</span>\<span class="pl-v">Replication</span>\<span class="pl-v">ReplicationStrategy</span>(); <span class="pl-s1"><span class="pl-c1">$</span>strategy</span>-><span class="pl-en">setScriptReadOnly</span>(<span class="pl-s1"><span class="pl-c1">$</span><span class="pl-c1">LUA_SCRIPT</span></span>); <span class="pl-k">return</span> <span class="pl-k">new</span> <span class="pl-v">Predis</span>\<span class="pl-v">Connection</span>\<span class="pl-v">Replication</span>\<span class="pl-v">MasterSlaveReplication</span>(<span class="pl-s1"><span class="pl-c1">$</span>strategy</span>); }]; <span class="pl-s1"><span class="pl-c1">$</span>client</span> = <span class="pl-k">new</span> <span class="pl-v">Predis</span>\<span class="pl-v">Client</span>(<span class="pl-s1"><span class="pl-c1">$</span>parameters</span>, <span class="pl-s1"><span class="pl-c1">$</span>options</span>); <span class="pl-s1"><span class="pl-c1">$</span>client</span>-><span class="pl-en">eval</span>(<span class="pl-s1"><span class="pl-c1">$</span><span class="pl-c1">LUA_SCRIPT</span></span>, <span class="pl-c1">0</span>); <span class="pl-c">// Sticks to slave using `eval`...</span> <span class="pl-s1"><span class="pl-c1">$</span>client</span>-><span class="pl-en">evalsha</span>(<span class="pl-en">sha1</span>(<span class="pl-s1"><span class="pl-c1">$</span><span class="pl-c1">LUA_SCRIPT</span></span>), <span class="pl-c1">0</span>); <span class="pl-c">// ... and `evalsha`, too.</span></pre></div> <p dir="auto">The <a href="/nicolas-grekas/predis/blob/main/examples"><code>examples</code></a> directory contains a few scripts that demonstrate how the client can be configured and used to leverage replication in both basic and complex scenarios.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Command pipelines</h3><a id="user-content-command-pipelines" class="anchor" aria-label="Permalink: Command pipelines" href="#command-pipelines"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Pipelining can help with performances when many commands need to be sent to a server by reducing the latency introduced by network round-trip timings. Pipelining also works with aggregate connections. The client can execute the pipeline inside a callable block or return a pipeline instance with the ability to chain commands thanks to its fluent interface:</p> <div class="highlight highlight-text-html-php notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="// Executes a pipeline inside the given callable block: $responses = $client->pipeline(function ($pipe) { for ($i = 0; $i < 1000; $i++) { $pipe->set("key:$i", str_pad($i, 4, '0', 0)); $pipe->get("key:$i"); } }); // Returns a pipeline that can be chained thanks to its fluent interface: $responses = $client->pipeline()->set('foo', 'bar')->get('foo')->execute();"><pre><span class="pl-c">// Executes a pipeline inside the given callable block:</span> <span class="pl-s1"><span class="pl-c1">$</span>responses</span> = <span class="pl-s1"><span class="pl-c1">$</span>client</span>-><span class="pl-en">pipeline</span>(<span class="pl-k">function</span> (<span class="pl-s1"><span class="pl-c1">$</span>pipe</span>) { <span class="pl-k">for</span> (<span class="pl-s1"><span class="pl-c1">$</span>i</span> = <span class="pl-c1">0</span>; <span class="pl-s1"><span class="pl-c1">$</span>i</span> < <span class="pl-c1">1000</span>; <span class="pl-s1"><span class="pl-c1">$</span>i</span>++) { <span class="pl-s1"><span class="pl-c1">$</span>pipe</span>-><span class="pl-en">set</span>(<span class="pl-s">"<span class="pl-s">key:</span><span class="pl-s1"><span class="pl-c1">$</span>i</span>"</span>, <span class="pl-en">str_pad</span>(<span class="pl-s1"><span class="pl-c1">$</span>i</span>, <span class="pl-c1">4</span>, <span class="pl-s">'<span class="pl-s">0</span>'</span>, <span class="pl-c1">0</span>)); <span class="pl-s1"><span class="pl-c1">$</span>pipe</span>-><span class="pl-en">get</span>(<span class="pl-s">"<span class="pl-s">key:</span><span class="pl-s1"><span class="pl-c1">$</span>i</span>"</span>); } }); <span class="pl-c">// Returns a pipeline that can be chained thanks to its fluent interface:</span> <span class="pl-s1"><span class="pl-c1">$</span>responses</span> = <span class="pl-s1"><span class="pl-c1">$</span>client</span>-><span class="pl-en">pipeline</span>()-><span class="pl-en">set</span>(<span class="pl-s">'<span class="pl-s">foo</span>'</span>, <span class="pl-s">'<span class="pl-s">bar</span>'</span>)-><span class="pl-en">get</span>(<span class="pl-s">'<span class="pl-s">foo</span>'</span>)-><span class="pl-en">execute</span>();</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Transactions</h3><a id="user-content-transactions" class="anchor" aria-label="Permalink: Transactions" href="#transactions"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The client provides an abstraction for Redis transactions based on <code>MULTI</code> and <code>EXEC</code> with a similar interface to command pipelines:</p> <div class="highlight highlight-text-html-php notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="// Executes a transaction inside the given callable block: $responses = $client->transaction(function ($tx) { $tx->set('foo', 'bar'); $tx->get('foo'); }); // Returns a transaction that can be chained thanks to its fluent interface: $responses = $client->transaction()->set('foo', 'bar')->get('foo')->execute();"><pre><span class="pl-c">// Executes a transaction inside the given callable block:</span> <span class="pl-s1"><span class="pl-c1">$</span>responses</span> = <span class="pl-s1"><span class="pl-c1">$</span>client</span>-><span class="pl-en">transaction</span>(<span class="pl-k">function</span> (<span class="pl-s1"><span class="pl-c1">$</span>tx</span>) { <span class="pl-s1"><span class="pl-c1">$</span>tx</span>-><span class="pl-en">set</span>(<span class="pl-s">'<span class="pl-s">foo</span>'</span>, <span class="pl-s">'<span class="pl-s">bar</span>'</span>); <span class="pl-s1"><span class="pl-c1">$</span>tx</span>-><span class="pl-en">get</span>(<span class="pl-s">'<span class="pl-s">foo</span>'</span>); }); <span class="pl-c">// Returns a transaction that can be chained thanks to its fluent interface:</span> <span class="pl-s1"><span class="pl-c1">$</span>responses</span> = <span class="pl-s1"><span class="pl-c1">$</span>client</span>-><span class="pl-en">transaction</span>()-><span class="pl-en">set</span>(<span class="pl-s">'<span class="pl-s">foo</span>'</span>, <span class="pl-s">'<span class="pl-s">bar</span>'</span>)-><span class="pl-en">get</span>(<span class="pl-s">'<span class="pl-s">foo</span>'</span>)-><span class="pl-en">execute</span>();</pre></div> <p dir="auto">This abstraction can perform check-and-set operations thanks to <code>WATCH</code> and <code>UNWATCH</code> and provides automatic retries of transactions aborted by Redis when <code>WATCH</code>ed keys are touched. For an example of a transaction using CAS you can see <a href="/nicolas-grekas/predis/blob/main/examples/transaction_using_cas.php">the following example</a>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Adding new commands</h3><a id="user-content-adding-new-commands" class="anchor" aria-label="Permalink: Adding new commands" href="#adding-new-commands"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">While we try to update Predis to stay up to date with all the commands available in Redis, you might prefer to stick with an old version of the library or provide a different way to filter arguments or parse responses for specific commands. To achieve that, Predis provides the ability to implement new command classes to define or override commands in the default command factory used by the client:</p> <div class="highlight highlight-text-html-php notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="// Define a new command by extending Predis\Command\Command: class BrandNewRedisCommand extends Predis\Command\Command { public function getId() { return 'NEWCMD'; } } // Inject your command in the current command factory: $client = new Predis\Client($parameters, [ 'commands' => [ 'newcmd' => 'BrandNewRedisCommand', ], ]); $response = $client->newcmd();"><pre><span class="pl-c">// Define a new command by extending Predis\Command\Command:</span> <span class="pl-k">class</span> BrandNewRedisCommand <span class="pl-k">extends</span> <span class="pl-v">Predis</span>\<span class="pl-v">Command</span>\Command { <span class="pl-k">public</span> <span class="pl-k">function</span> <span class="pl-en">getId</span>() { <span class="pl-k">return</span> <span class="pl-s">'<span class="pl-s">NEWCMD</span>'</span>; } } <span class="pl-c">// Inject your command in the current command factory:</span> <span class="pl-s1"><span class="pl-c1">$</span>client</span> = <span class="pl-k">new</span> <span class="pl-v">Predis</span>\<span class="pl-v">Client</span>(<span class="pl-s1"><span class="pl-c1">$</span>parameters</span>, [ <span class="pl-s">'<span class="pl-s">commands</span>'</span> => [ <span class="pl-s">'<span class="pl-s">newcmd</span>'</span> => <span class="pl-s">'<span class="pl-s">BrandNewRedisCommand</span>'</span>, ], ]); <span class="pl-s1"><span class="pl-c1">$</span>response</span> = <span class="pl-s1"><span class="pl-c1">$</span>client</span>-><span class="pl-en">newcmd</span>();</pre></div> <p dir="auto">There is also a method to send raw commands without filtering their arguments or parsing responses. Users must provide the list of arguments for the command as an array, following the signatures as defined by the <a href="http://redis.io/commands" rel="nofollow">Redis documentation for commands</a>:</p> <div class="highlight highlight-text-html-php notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$response = $client->executeRaw(['SET', 'foo', 'bar']);"><pre><span class="pl-s1"><span class="pl-c1">$</span>response</span> = <span class="pl-s1"><span class="pl-c1">$</span>client</span>-><span class="pl-en">executeRaw</span>([<span class="pl-s">'<span class="pl-s">SET</span>'</span>, <span class="pl-s">'<span class="pl-s">foo</span>'</span>, <span class="pl-s">'<span class="pl-s">bar</span>'</span>]);</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Script commands</h3><a id="user-content-script-commands" class="anchor" aria-label="Permalink: Script commands" href="#script-commands"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">While it is possible to leverage <a href="http://redis.io/commands/eval" rel="nofollow">Lua scripting</a> on Redis 2.6+ using directly <a href="http://redis.io/commands/eval" rel="nofollow"><code>EVAL</code></a> and <a href="http://redis.io/commands/evalsha" rel="nofollow"><code>EVALSHA</code></a>, Predis offers script commands as an higher level abstraction built upon them to make things simple. Script commands can be registered in the command factory used by the client and are accessible as if they were plain Redis commands, but they define Lua scripts that get transmitted to the server for remote execution. Internally they use <a href="http://redis.io/commands/evalsha" rel="nofollow"><code>EVALSHA</code></a> by default and identify a script by its SHA1 hash to save bandwidth, but <a href="http://redis.io/commands/eval" rel="nofollow"><code>EVAL</code></a> is used as a fall back when needed:</p> <div class="highlight highlight-text-html-php notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="// Define a new script command by extending Predis\Command\ScriptCommand: class ListPushRandomValue extends Predis\Command\ScriptCommand { public function getKeysCount() { return 1; } public function getScript() { return <<<LUA math.randomseed(ARGV[1]) local rnd = tostring(math.random()) redis.call('lpush', KEYS[1], rnd) return rnd LUA; } } // Inject the script command in the current command factory: $client = new Predis\Client($parameters, [ 'commands' => [ 'lpushrand' => 'ListPushRandomValue', ], ]); $response = $client->lpushrand('random_values', $seed = mt_rand());"><pre><span class="pl-c">// Define a new script command by extending Predis\Command\ScriptCommand:</span> <span class="pl-k">class</span> ListPushRandomValue <span class="pl-k">extends</span> <span class="pl-v">Predis</span>\<span class="pl-v">Command</span>\ScriptCommand { <span class="pl-k">public</span> <span class="pl-k">function</span> <span class="pl-en">getKeysCount</span>() { <span class="pl-k">return</span> <span class="pl-c1">1</span>; } <span class="pl-k">public</span> <span class="pl-k">function</span> <span class="pl-en">getScript</span>() { <span class="pl-k">return</span> <span class="pl-s"><<<LUA<span class="pl-s"></span></span> <span class="pl-s"><span class="pl-s"><span class="pl-s">math.randomseed(ARGV[1])</span></span></span> <span class="pl-s"><span class="pl-s"><span class="pl-s">local rnd = tostring(math.random())</span></span></span> <span class="pl-s"><span class="pl-s"><span class="pl-s">redis.call('lpush', KEYS[1], rnd)</span></span></span> <span class="pl-s"><span class="pl-s"><span class="pl-s">return rnd</span></span></span> <span class="pl-s">LUA</span>; } } <span class="pl-c">// Inject the script command in the current command factory:</span> <span class="pl-s1"><span class="pl-c1">$</span>client</span> = <span class="pl-k">new</span> <span class="pl-v">Predis</span>\<span class="pl-v">Client</span>(<span class="pl-s1"><span class="pl-c1">$</span>parameters</span>, [ <span class="pl-s">'<span class="pl-s">commands</span>'</span> => [ <span class="pl-s">'<span class="pl-s">lpushrand</span>'</span> => <span class="pl-s">'<span class="pl-s">ListPushRandomValue</span>'</span>, ], ]); <span class="pl-s1"><span class="pl-c1">$</span>response</span> = <span class="pl-s1"><span class="pl-c1">$</span>client</span>-><span class="pl-en">lpushrand</span>(<span class="pl-s">'<span class="pl-s">random_values</span>'</span>, <span class="pl-s1"><span class="pl-c1">$</span>seed</span> = <span class="pl-en">mt_rand</span>());</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Customizable connection backends</h3><a id="user-content-customizable-connection-backends" class="anchor" aria-label="Permalink: Customizable connection backends" href="#customizable-connection-backends"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Predis can use different connection backends to connect to Redis. Two of them leverage a third party extension such as <a href="https://github.com/nrk/phpiredis">phpiredis</a> resulting in major performance gains especially when dealing with big multibulk responses. While one is based on PHP streams, the other is based on socket resources provided by <code>ext-socket</code>. Both support TCP/IP and UNIX domain sockets:</p> <div class="highlight highlight-text-html-php notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$client = new Predis\Client('tcp://127.0.0.1', [ 'connections' => [ 'tcp' => 'Predis\Connection\PhpiredisStreamConnection', // PHP stream resources 'unix' => 'Predis\Connection\PhpiredisSocketConnection', // ext-socket resources ], ]);"><pre><span class="pl-s1"><span class="pl-c1">$</span>client</span> = <span class="pl-k">new</span> <span class="pl-v">Predis</span>\<span class="pl-v">Client</span>(<span class="pl-s">'<span class="pl-s">tcp://127.0.0.1</span>'</span>, [ <span class="pl-s">'<span class="pl-s">connections</span>'</span> => [ <span class="pl-s">'<span class="pl-s">tcp</span>'</span> => <span class="pl-s">'<span class="pl-s">Predis\Connection\PhpiredisStreamConnection</span>'</span>, <span class="pl-c">// PHP stream resources</span> <span class="pl-s">'<span class="pl-s">unix</span>'</span> => <span class="pl-s">'<span class="pl-s">Predis\Connection\PhpiredisSocketConnection</span>'</span>, <span class="pl-c">// ext-socket resources</span> ], ]);</pre></div> <p dir="auto">The client can also be configured to rely on a <a href="https://github.com/nrk/phpiredis">phpiredis</a>-backend by specifying a descriptive string for the <code>connections</code> client option. Supported string values are:</p> <ul dir="auto"> <li><code>phpiredis-stream</code> maps <code>tcp</code>, <code>redis</code> and <code>unix</code> to <code>Predis\Connection\PhpiredisStreamConnection</code></li> <li><code>phpiredis-socket</code> maps <code>tcp</code>, <code>redis</code> and <code>unix</code> to <code>Predis\Connection\PhpiredisSocketConnection</code></li> <li><code>phpiredis</code> is simply an alias of <code>phpiredis-stream</code></li> </ul> <div class="highlight highlight-text-html-php notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$client = new Predis\Client('tcp://127.0.0.1', ['connections' => 'phpiredis']);"><pre><span class="pl-s1"><span class="pl-c1">$</span>client</span> = <span class="pl-k">new</span> <span class="pl-v">Predis</span>\<span class="pl-v">Client</span>(<span class="pl-s">'<span class="pl-s">tcp://127.0.0.1</span>'</span>, [<span class="pl-s">'<span class="pl-s">connections</span>'</span> => <span class="pl-s">'<span class="pl-s">phpiredis</span>'</span>]);</pre></div> <p dir="auto">Developers can create their own connection classes to support whole new network backends, extend existing classes or provide completely different implementations. Connection classes must implement <code>Predis\Connection\NodeConnectionInterface</code> or extend <code>Predis\Connection\AbstractConnection</code>:</p> <div class="highlight highlight-text-html-php notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="class MyConnectionClass implements Predis\Connection\NodeConnectionInterface { // Implementation goes here... } // Use MyConnectionClass to handle connections for the `tcp` scheme: $client = new Predis\Client('tcp://127.0.0.1', [ 'connections' => ['tcp' => 'MyConnectionClass'], ]);"><pre><span class="pl-k">class</span> MyConnectionClass <span class="pl-k">implements</span> <span class="pl-v">Predis</span>\<span class="pl-v">Connection</span>\NodeConnectionInterface { <span class="pl-c">// Implementation goes here...</span> } <span class="pl-c">// Use MyConnectionClass to handle connections for the `tcp` scheme:</span> <span class="pl-s1"><span class="pl-c1">$</span>client</span> = <span class="pl-k">new</span> <span class="pl-v">Predis</span>\<span class="pl-v">Client</span>(<span class="pl-s">'<span class="pl-s">tcp://127.0.0.1</span>'</span>, [ <span class="pl-s">'<span class="pl-s">connections</span>'</span> => [<span class="pl-s">'<span class="pl-s">tcp</span>'</span> => <span class="pl-s">'<span class="pl-s">MyConnectionClass</span>'</span>], ]);</pre></div> <p dir="auto">For a more in-depth insight on how to create new connection backends you can refer to the actual implementation of the standard connection classes available in the <code>Predis\Connection</code> namespace.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Development</h2><a id="user-content-development" class="anchor" aria-label="Permalink: Development" href="#development"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Reporting bugs and contributing code</h3><a id="user-content-reporting-bugs-and-contributing-code" class="anchor" aria-label="Permalink: Reporting bugs and contributing code" href="#reporting-bugs-and-contributing-code"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Contributions to Predis are highly appreciated either in the form of pull requests for new features, bug fixes, or just bug reports. We only ask you to adhere to a <a href="/nicolas-grekas/predis/blob/main/CONTRIBUTING.md">basic set of rules</a> before submitting your changes or filing bugs on the issue tracker to make it easier for everyone to stay consistent while working on the project.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Test suite</h3><a id="user-content-test-suite" class="anchor" aria-label="Permalink: Test suite" href="#test-suite"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><strong>ATTENTION</strong>: Do not ever run the test suite shipped with Predis against instances of Redis running in production environments or containing data you are interested in!</p> <p dir="auto">Predis has a comprehensive test suite covering every aspect of the library and that can optionally perform integration tests against a running instance of Redis (required >= 2.4.0 in order to verify the correct behavior of the implementation of each command. Integration tests for unsupported Redis commands are automatically skipped. If you do not have Redis up and running, integration tests can be disabled. See <a href="/nicolas-grekas/predis/blob/main/tests/README.md">the tests README</a> for more details about testing this library.</p> <p dir="auto">Predis uses GitHub Actions for continuous integration and the history for past and current builds can be found <a href="https://github.com/predis/predis/actions">on its actions page</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Other</h2><a id="user-content-other" class="anchor" aria-label="Permalink: Other" href="#other"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Project related links</h3><a id="user-content-project-related-links" class="anchor" aria-label="Permalink: Project related links" href="#project-related-links"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li><a href="https://github.com/predis/predis">Source code</a></li> <li><a href="https://github.com/predis/predis/wiki">Wiki</a></li> <li><a href="https://github.com/predis/predis/issues">Issue tracker</a></li> </ul> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Author</h3><a id="user-content-author" class="anchor" aria-label="Permalink: Author" href="#author"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li><a href="mailto:suppakilla@gmail.com">Daniele Alessandri</a> (<a href="http://twitter.com/JoL1hAHN" rel="nofollow">twitter</a>)</li> <li><a href="https://till.im" rel="nofollow">Till Krüss</a> (<a href="http://twitter.com/tillkruss" rel="nofollow">Twitter</a>)</li> </ul> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">License</h3><a id="user-content-license" class="anchor" aria-label="Permalink: License" href="#license"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The code for Predis is distributed under the terms of the MIT license (see <a href="/nicolas-grekas/predis/blob/main/LICENSE">LICENSE</a>).</p> </article></div></div></div></div></div> <!-- --> <!-- --> <script type="application/json" id="__PRIMER_DATA_:R0:__">{"resolvedServerColorMode":"day"}</script></div> </react-partial> <input type="hidden" data-csrf="true" value="E7zE+Xbso2sJRZpvxFrRI1XPoJYWnm89O5w91TG/Ryjo7tVaew35yNZmU4rxetLDTx8BZWu8pDT90G15sFYRSw==" /> </div> <div data-view-component="true" class="Layout-sidebar"> <div class="BorderGrid about-margin" data-pjax> <div class="BorderGrid-row"> <div 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