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href="/w/index.php?title=Special:CreateAccount&returnto=Developer+hub" title="You are encouraged to create an account and log in; however, it is not mandatory"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Create account</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Special:UserLogin&returnto=Developer+hub" title="You are encouraged to log in; however, it is not mandatory [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Log in</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Pages for logged out editors <a href="/wiki/Help:Contents" aria-label="Learn more about editing"><span>learn more</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/Special:MyContributions" title="A list of edits made from this IP address [y]" accesskey="y"><span>Contributions</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Special:MyTalk" title="Discussion about edits from this IP address [n]" accesskey="n"><span>Talk</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"><div id="mw-dismissablenotice-anonplace"></div><script>(function(){var node=document.getElementById("mw-dismissablenotice-anonplace");if(node){node.outerHTML="\u003Cdiv class=\"mw-dismissable-notice\"\u003E\u003Cdiv class=\"mw-dismissable-notice-close\"\u003E[\u003Ca tabindex=\"0\" role=\"button\"\u003Edismiss\u003C/a\u003E]\u003C/div\u003E\u003Cdiv class=\"mw-dismissable-notice-body\"\u003E\u003C!-- CentralNotice --\u003E\u003Cdiv id=\"localNotice\" data-nosnippet=\"\"\u003E\u003Cdiv class=\"sitenotice\" lang=\"en\" dir=\"ltr\"\u003E\u003Ccenter\u003E\n\u003Cdiv style=\"width:100%; padding:15px; border-style:solid; border-width:2px; border-color:var(--color-placeholder, black); font-size:14px; text-align:center;\" class=\"plainlinks\"\u003E\u003Cdiv style=\"vertical-align:middle;margin-top:0.5em\"\u003E\u003Cfigure class=\"mw-halign-left skin-invert\" typeof=\"mw:File\"\u003E\u003Ca href=\"/wiki/MediaWiki_Users_and_Developers_Conference\" title=\"MediaWiki Users and Developers Conference\"\u003E\u003Cimg src=\"//upload.wikimedia.org/wikipedia/commons/thumb/7/71/MediaWikiUsersDevelopersConferenceWordmark.png/120px-MediaWikiUsersDevelopersConferenceWordmark.png\" decoding=\"async\" width=\"100\" height=\"44\" class=\"mw-file-element\" srcset=\"//upload.wikimedia.org/wikipedia/commons/thumb/7/71/MediaWikiUsersDevelopersConferenceWordmark.png/250px-MediaWikiUsersDevelopersConferenceWordmark.png 1.5x\" data-file-width=\"1080\" data-file-height=\"480\" /\u003E\u003C/a\u003E\u003Cfigcaption\u003E\u003C/figcaption\u003E\u003C/figure\u003E\u003C/div\u003E\n\u003Cp\u003EEarly bird tickets for the \u003Ca href=\"/wiki/MediaWiki_Users_and_Developers_Conference_Spring_2025\" title=\"MediaWiki Users and Developers Conference Spring 2025\"\u003EMediaWiki Users and Developers Conference Spring 2025\u003C/a\u003E in \u003Ca href=\"https://en.wikipedia.org/wiki/Sandusky,_Ohio\" class=\"extiw\" title=\"w:Sandusky, Ohio\"\u003ESandusky\u003C/a\u003E, Ohio, USA are now \u003Ca rel=\"nofollow\" class=\"external text\" href=\"https://www.eventbrite.com/e/mediawiki-users-and-developers-conference-spring-2025-tickets-1254864847539\"\u003E\u003Cb\u003Eon sale on Eventbrite\u003C/b\u003E\u003C/a\u003E until April 13! In addition, the \u003Ca href=\"/wiki/MediaWiki_Users_and_Developers_Conference/Scholarships\" title=\"MediaWiki Users and Developers Conference/Scholarships\"\u003Escholarship application\u003C/a\u003E is open now until April 15.\n\u003C/p\u003E\n\u003C/div\u003E\n\u003C/center\u003E\u003C/div\u003E\u003C/div\u003E\u003C/div\u003E\u003C/div\u003E";}}());</script></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Site"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Contents" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div 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</div> </a> <ul id="toc-Overview-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Key_documents" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Key_documents"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Key documents</span> </div> </a> <button aria-controls="toc-Key_documents-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Key documents subsection</span> </button> <ul id="toc-Key_documents-sublist" class="vector-toc-list"> <li id="toc-Code,_development_and_style" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Code,_development_and_style"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Code, development and style</span> </div> </a> <ul id="toc-Code,_development_and_style-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Debugging_and_testing" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Debugging_and_testing"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2</span> <span>Debugging and testing</span> </div> </a> <ul id="toc-Debugging_and_testing-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Architecture" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Architecture"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3</span> <span>Architecture</span> </div> </a> <ul id="toc-Architecture-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Sub-systems" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Sub-systems"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.4</span> <span>Sub-systems</span> </div> </a> <ul id="toc-Sub-systems-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li 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id="toc-Help_for_skin_developers" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Help_for_skin_developers"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2</span> <span>Help for skin developers</span> </div> </a> <ul id="toc-Help_for_skin_developers-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Help_for_gadget_developers" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Help_for_gadget_developers"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.3</span> <span>Help for gadget developers</span> </div> </a> <ul id="toc-Help_for_gadget_developers-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Help_for_module_developers" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Help_for_module_developers"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.4</span> <span>Help for module developers</span> </div> </a> <ul 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id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-pt-translate-header noprint nomobile" dir="ltr" lang="en"><a href="/w/index.php?title=Special:Translate&group=page-Developer+hub&action=page&filter=&action_source=translate_page" title="Special:Translate">Translate this page</a></div><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="mw-pt-languages noprint navigation-not-searchable" lang="en" dir="ltr"><div class="mw-pt-languages-label">Languages:</div><ul class="mw-pt-languages-list"><li><a href="/w/index.php?title=Special:Translate&group=page-Developer+hub&language=&task=view" class="new" title="Start translation for this language" lang="" dir="ltr"></a></li> <li><a href="/wiki/Developer_hub/id" class="mw-pt-progress mw-pt-progress--high" title="Pusat pengembang (90% translated)" lang="id" dir="ltr">Bahasa Indonesia</a></li> <li><a href="/wiki/Developer_hub/de" class="mw-pt-progress 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desenvolupadors (70% translated)" lang="ca" dir="ltr">català</a></li> <li><a href="/wiki/Developer_hub/da" class="mw-pt-progress mw-pt-progress--med" title="Udvikler hub (57% translated)" lang="da" dir="ltr">dansk</a></li> <li><a href="/wiki/Developer_hub/es" class="mw-pt-progress mw-pt-progress--high" title="Centro de desarrolladores (90% translated)" lang="es" dir="ltr">español</a></li> <li><a href="/wiki/Developer_hub/fr" class="mw-pt-progress mw-pt-progress--high" title="Pôle des développeurs (90% translated)" lang="fr" dir="ltr">français</a></li> <li><a href="/wiki/Developer_hub/gl" class="mw-pt-progress mw-pt-progress--low" title="''Hub'' desenvolvedor (12% translated)" lang="gl" dir="ltr">galego</a></li> <li><a href="/wiki/Developer_hub/ia" class="mw-pt-progress mw-pt-progress--low" title="Cardine del disveloppatores (7% translated)" lang="ia" dir="ltr">interlingua</a></li> <li><a href="/wiki/Developer_hub/it" class="mw-pt-progress mw-pt-progress--low" title="Hub degli Sviluppatori (9% translated)" lang="it" dir="ltr">italiano</a></li> <li><a href="/wiki/Developer_hub/hu" class="mw-pt-progress mw-pt-progress--low" title="Developer hub/hu (1% translated)" lang="hu" dir="ltr">magyar</a></li> <li><a href="/wiki/Developer_hub/pl" class="mw-pt-progress mw-pt-progress--high" title="Developer hub (88% translated)" lang="pl" dir="ltr">polski</a></li> <li><a href="/wiki/Developer_hub/pt" class="mw-pt-progress mw-pt-progress--high" title="Portal dos Programadores (88% translated)" lang="pt" dir="ltr">português</a></li> <li><a href="/wiki/Developer_hub/pt-br" class="mw-pt-progress mw-pt-progress--high" title="Central do desenvolvedor (90% translated)" lang="pt-BR" dir="ltr">português do Brasil</a></li> <li><a href="/wiki/Developer_hub/ro" class="mw-pt-progress mw-pt-progress--low" title="Hub pentru dezvoltatori (7% translated)" lang="ro" dir="ltr">română</a></li> <li><a href="/wiki/Developer_hub/fi" class="mw-pt-progress mw-pt-progress--low" title="Kehittäjien luola (12% translated)" lang="fi" dir="ltr">suomi</a></li> <li><a href="/wiki/Developer_hub/cs" class="mw-pt-progress mw-pt-progress--complete" title="Rozcestník pro vývojáře (100% translated)" lang="cs" dir="ltr">čeština</a></li> <li><a href="/wiki/Developer_hub/bg" class="mw-pt-progress mw-pt-progress--low" title="Developer hub/bg (4% translated)" lang="bg" dir="ltr">български</a></li> <li><a href="/wiki/Developer_hub/ru" class="mw-pt-progress mw-pt-progress--high" title="Портал разработчиков (90% translated)" lang="ru" dir="ltr">русский</a></li> <li><a href="/wiki/Developer_hub/tg" class="mw-pt-progress mw-pt-progress--low" title="Developer hub/tg (0% translated)" lang="tg" dir="ltr">тоҷикӣ</a></li> <li><a href="/wiki/Developer_hub/ar" class="mw-pt-progress mw-pt-progress--low" title="مركز المطورون (13% translated)" lang="ar" dir="rtl">العربية</a></li> <li><a href="/wiki/Developer_hub/sd" class="mw-pt-progress mw-pt-progress--low" title="ڊولپر حب (12% translated)" lang="sd" dir="rtl">سنڌي</a></li> <li><a href="/wiki/Developer_hub/fa" class="mw-pt-progress mw-pt-progress--high" title="مرکز توسعه دهنده (90% translated)" lang="fa" dir="rtl">فارسی</a></li> <li><a href="/wiki/Developer_hub/anp" class="mw-pt-progress mw-pt-progress--low" title="डेवलपर हब (7% translated)" lang="anp" dir="ltr">अंगिका</a></li> <li><a href="/wiki/Developer_hub/si" class="mw-pt-progress mw-pt-progress--low" title="වැඩිදියුණුකරන්නාගේ මධ්‍යස්ථානය (10% translated)" lang="si" dir="ltr">සිංහල</a></li> <li><a href="/wiki/Developer_hub/th" class="mw-pt-progress mw-pt-progress--med" title="ศูนย์กลางนักพัฒนา (27% translated)" lang="th" dir="ltr">ไทย</a></li> <li><a href="/wiki/Developer_hub/zh" class="mw-pt-progress mw-pt-progress--high" title="开发者中心 (90% translated)" lang="zh" dir="ltr">中文</a></li> <li><a href="/wiki/Developer_hub/ja" class="mw-pt-progress mw-pt-progress--high" title="開発者ハブ (93% translated)" lang="ja" dir="ltr">日本語</a></li> <li><a href="/wiki/Developer_hub/yue" class="mw-pt-progress mw-pt-progress--low" title="技術員中心 (6% translated)" lang="yue" dir="ltr">粵語</a></li> <li><a href="/wiki/Developer_hub/mni" class="mw-pt-progress mw-pt-progress--low" title="ꯁꯥꯒꯠꯂꯤꯕ ꯃꯐꯝ (9% translated)" lang="mni" dir="ltr">ꯃꯤꯇꯩ ꯂꯣꯟ</a></li> <li><a href="/wiki/Developer_hub/ko" class="mw-pt-progress mw-pt-progress--med" title="개발자 허브 (67% translated)" lang="ko" dir="ltr">한국어</a></li></ul></div> <div style="clear: right; margin-bottom: .5em; float: right; margin-left:2em; width: auto;"><meta property="mw:PageProp/toc" /></div> <ul class="hubs hubs-pagedir-ltr hubs-align-none"> <style data-mw-deduplicate="TemplateStyles:r4454566">.mw-parser-output .hubs{display:flex}.mw-parser-output .hubs-pagedir-ltr{margin:0 0.5em 0.5em 0}.mw-parser-output .hubs-pagedir-rtl{margin:0 0 0.5em 0.5em}.mw-parser-output .hubs-pagedir-ltr.hubs-align-right{margin:0 0 0.5em 1em}.mw-parser-output .hubs-pagedir-rtl.hubs-align-right{margin:0 1em 0.5em 0}.mw-parser-output .hubs-align-left.hubs-pagedir-ltr,.mw-parser-output .hubs-align-right.hubs-pagedir-rtl{float:left}.mw-parser-output .hubs-align-right.hubs-pagedir-ltr,.mw-parser-output .hubs-align-left.hubs-pagedir-rtl{float:right}.mw-parser-output .hubs-align-center::before,.mw-parser-output .hubs-align-center::after{display:inline-block;content:"";flex-grow:1}.mw-parser-output .hubs li{display:inline-block;margin:0;border:1px solid #a2a9b1;padding:5px;background-color:#f8f9fa}.mw-parser-output .hubs li:not(:first-child){margin-left:-1px}.mw-parser-output .hub-highlighted{font-size:100%;font-weight:bold;background-color:#cff}</style> <li><span typeof="mw:File"><a href="/wiki/File:Community_Noun_project_2280.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/9d/Community_Noun_project_2280.svg/20px-Community_Noun_project_2280.svg.png" decoding="async" width="20" height="19" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/9d/Community_Noun_project_2280.svg/40px-Community_Noun_project_2280.svg.png 1.5x" data-file-width="107" data-file-height="100" /></a></span> <a href="/wiki/Special:MyLanguage/User_hub" title="Special:MyLanguage/User hub">Users</a><span style="display:none"><a href="/wiki/User_hub" title="User hub"> </a></span></li> <li><span typeof="mw:File"><a href="/wiki/File:Octicons-terminal.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Octicons-terminal.svg/20px-Octicons-terminal.svg.png" decoding="async" width="20" height="23" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Octicons-terminal.svg/40px-Octicons-terminal.svg.png 1.5x" data-file-width="896" data-file-height="1024" /></a></span> <a href="/wiki/Special:MyLanguage/Sysadmin_hub" title="Special:MyLanguage/Sysadmin hub">System Administrators</a><span style="display:none"><a href="/wiki/Sysadmin_hub" title="Sysadmin hub"> </a></span></li> <li class="hub-highlighted"><span typeof="mw:File"><a href="/wiki/File:Source_code_project_1171.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/be/Source_code_project_1171.svg/20px-Source_code_project_1171.svg.png" decoding="async" width="20" height="9" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/be/Source_code_project_1171.svg/40px-Source_code_project_1171.svg.png 1.5x" data-file-width="512" data-file-height="224" /></a></span> <b><a href="/wiki/Special:MyLanguage/Developer_hub" title="Special:MyLanguage/Developer hub">Developers</a></b><span style="display:none"><a class="mw-selflink selflink"> </a></span></li> <li><span typeof="mw:File"><a href="/wiki/File:OOjs_UI_icon_language-ltr.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/43/OOjs_UI_icon_language-ltr.svg/20px-OOjs_UI_icon_language-ltr.svg.png" decoding="async" width="20" height="20" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/43/OOjs_UI_icon_language-ltr.svg/30px-OOjs_UI_icon_language-ltr.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/43/OOjs_UI_icon_language-ltr.svg/40px-OOjs_UI_icon_language-ltr.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span> <a href="/wiki/Special:MyLanguage/Translator_hub" title="Special:MyLanguage/Translator hub">Translators</a><span style="display:none"><a href="/wiki/Translator_hub" title="Translator hub"> </a></span></li> </ul> <p><br /> <b>This is a high-level overview of MediaWiki development</b>, including links to the key documents, resources and tools available to MediaWiki developers. It is written <b>for skilled <a href="https://en.wikipedia.org/wiki/LAMP_(software_bundle)" class="extiw" title="w:LAMP (software bundle)">LAMP</a> developers who have experience using MediaWiki</b>. </p> <ul><li>If you want to <i>use</i> Wikimedia web APIs, visit <a class="external text" href="https://developer.wikimedia.org/use-content/">the Developer Portal</a>.</li> <li>If you want to contribute to developing Wikimedia software, see <a href="/wiki/Special:MyLanguage/New_Developers" title="Special:MyLanguage/New Developers">New Developers</a><span style="display:none"><a href="/wiki/New_Developers" title="New Developers"> </a></span>.</li> <li>For an introductory guide to developing MediaWiki and MediaWiki extensions, read <a href="/wiki/Special:MyLanguage/How_to_become_a_MediaWiki_hacker" title="Special:MyLanguage/How to become a MediaWiki hacker">How to become a MediaWiki hacker</a><span style="display:none"><a href="/wiki/How_to_become_a_MediaWiki_hacker" title="How to become a MediaWiki hacker"> </a></span>.</li> <li>If you want to collaborate with other third-party MediaWiki users, the <a href="/wiki/Special:MyLanguage/MediaWiki_Stakeholders%27_Group" title="Special:MyLanguage/MediaWiki Stakeholders' Group">MediaWiki Stakeholders' Group</a><span style="display:none"><a href="/wiki/MediaWiki_Stakeholders%27_Group" title="MediaWiki Stakeholders' Group"> </a></span> (MWStake) is a MediaWiki <a href="/wiki/Special:MyLanguage/Groups" title="Special:MyLanguage/Groups">user group</a> consisting of MediaWiki developers, system administrators, users, consultants, and hosting providers.</li></ul> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Overview" data-mw-thread-id="h-Overview"><span data-mw-comment-start="" id="h-Overview"></span>Overview<span data-mw-comment-end="h-Overview"></span></h2></div> <p>MediaWiki is the software that powers Wikipedia, its sister projects and thousands of wikis all over the world. </p><p>MediaWiki is written in the <a rel="nofollow" class="external text" href="https://php.net">PHP</a> programming language.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> It uses jQuery as the client JavaScript library. </p><p>MediaWiki is primarily written for the <a href="https://en.wikipedia.org/wiki/LAMP_(software_bundle)" class="extiw" title="w:LAMP (software bundle)">LAMP platform</a><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> and runs on most operating systems. MediaWiki primarily uses the MySQL and MariaDB database servers.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p><p>Development happens in an <a href="https://en.wikipedia.org/wiki/Open_Source" class="extiw" title="w:Open Source">open source</a> style<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup>, is largely coordinated online, and supported by the Wikimedia Foundation, though volunteer community developers play a huge part as well. </p> <ul><li><b>Development discussion</b> happens on various <a href="/wiki/Special:MyLanguage/Mailing_lists" title="Special:MyLanguage/Mailing lists">mailing lists</a> and <a href="/wiki/Special:MyLanguage/MediaWiki_on_IRC" title="Special:MyLanguage/MediaWiki on IRC">IRC channels</a>. The main developer list is <a href="https://lists.wikimedia.org/postorius/lists/wikitech-l.lists.wikimedia.org/" class="extiw" title="mail:wikitech-l">wikitech-l</a>. The main developer IRC channel is <style data-mw-deduplicate="TemplateStyles:r7217526">.mw-parser-output .irc-connect>a{color:green}@media screen{html.skin-theme-clientpref-night .mw-parser-output .irc-connect>a{color:#12c812}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .irc-connect>a{color:#12c812}}</style><span class="plainlinks" style="font-family: monospace,Courier; white-space: pre-wrap !important; word-wrap: break-word; max-width: 1200px; overflow: auto;" title="#mediawiki on Libera.Chat IRC"><a rel="nofollow" class="external text" href="ircs://irc.libera.chat:6697/mediawiki">#mediawiki</a></span> <sup class="plainlinks irc-connect"><a rel="nofollow" class="external text" href="https://web.libera.chat/?channel=#mediawiki">connect</a></sup>.</li> <li><b>Source code</b> is managed using the <a href="https://en.wikipedia.org/wiki/Git" class="extiw" title="w:Git">Git</a> version control system.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup></li> <li><b>Code review</b> for most projects is performed on <a href="/wiki/Special:MyLanguage/Gerrit" title="Special:MyLanguage/Gerrit">Gerrit</a><span style="display:none"><a href="/wiki/Gerrit" title="Gerrit"> </a></span>. <a href="/wiki/Gerrit/Tutorial" title="Gerrit/Tutorial">Follow this tutorial</a> to set up Git and Gerrit in order to submit patches.</li> <li><b>Bug reports</b> and tasks for most projects are managed on <a href="/wiki/Special:MyLanguage/Phabricator" title="Special:MyLanguage/Phabricator">Phabricator</a><span style="display:none"><a href="/wiki/Phabricator" title="Phabricator"> </a></span>.</li> <li>Developers <b>extending</b> or <b>interfacing</b> with MediaWiki (instead of working on the core code) have several convenient <a href="/wiki/Special:MyLanguage/Manual:Developing_extensions#Extension_points" title="Special:MyLanguage/Manual:Developing extensions">extension points</a><span style="display:none"><a href="/wiki/Manual:Developing_extensions#Extension_points" title="Manual:Developing extensions"> </a></span>, including the <a href="/wiki/Special:MyLanguage/API:Main_page" title="Special:MyLanguage/API:Main page">API</a> and the <a href="/wiki/Special:MyLanguage/Manual:Hooks" title="Special:MyLanguage/Manual:Hooks">Hooks</a> system.</li></ul> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Key_documents" data-mw-thread-id="h-Key_documents"><span data-mw-comment-start="" id="h-Key_documents"></span>Key documents<span data-mw-comment-end="h-Key_documents"></span></h2></div> <style data-mw-deduplicate="TemplateStyles:r6713801">.mw-parser-output .tpl-contentgrid{margin:1em 0;display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2em;grid-auto-rows:minmax(100px,auto)}.mw-parser-output .tpl-contentgrid .mw-tpl-colorbox{margin:0}</style> <div class="tpl-contentgrid" style=""><style data-mw-deduplicate="TemplateStyles:r6969224">.mw-parser-output .wiki-template-infocard{border:1px solid var(--border-color-subtle,#c8ccd1);box-shadow:0 1px 1px rgba(0,0,0,0.15);border-radius:2px;padding:1em;display:flex;flex-direction:column;justify-content:space-between;align-content:stretch}.mw-parser-output .wiki-template-infocard-title{padding:0 0 0.5625em 0;margin:0}.mw-parser-output .wiki-template-infocard-content{clear:both;flex:1 1 auto}.mw-parser-output .wiki-template-infocard-footer{padding-top:1.5em}@media screen{html.skin-theme-clientpref-night .mw-parser-output .wiki-template-infocard-title img{filter:invert(1)}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .wiki-template-infocard-title img{filter:invert(1)}}</style> <div class="wiki-template-infocard"> <h3 id="Code,_development_and_style" class="wiki-template-infocard-title" data-mw-thread-id="h-Code,_development_and_style-Key_documents"><span id="Code.2C_development_and_style"></span><span data-mw-comment-start="" id="h-Code,_development_and_style-Key_documents"></span>Code, development and style<span data-mw-comment-end="h-Code,_development_and_style-Key_documents"></span></h3> <div class="wiki-template-infocard-content"> <ul><li><b><a href="/wiki/Special:MyLanguage/Development_policy" title="Special:MyLanguage/Development policy">Development policy</a><span style="display:none"><a href="/wiki/Development_policy" title="Development policy"> </a></span></b> – an overview of key development policies.</li> <li><b><a href="/wiki/Special:MyLanguage/Manual:Coding_conventions" title="Special:MyLanguage/Manual:Coding conventions">Coding conventions</a></b> – learn how to write code in the MediaWiki style.</li> <li><b><a href="/wiki/Special:MyLanguage/Security_for_developers" title="Special:MyLanguage/Security for developers">Security for developers</a><span style="display:none"><a href="/wiki/Security_for_developers" title="Security for developers"> </a></span></b> – learn how to help keep MediaWiki secure.</li> <li><b><a href="/wiki/Special:MyLanguage/Manual:Pre-commit_checklist" title="Special:MyLanguage/Manual:Pre-commit checklist">Pre-commit checklist</a><span style="display:none"><a href="/wiki/Manual:Pre-commit_checklist" title="Manual:Pre-commit checklist"> </a></span></b> – read this checklist before committing code.</li> <li><b><a href="/wiki/Special:MyLanguage/Gerrit/Code_review" title="Special:MyLanguage/Gerrit/Code review">Code review guide</a></b> – a guide for reviewers of commits to the MediaWiki source code.</li> <li><b><a href="/wiki/Special:MyLanguage/Technical_Decision_Making_Process" title="Special:MyLanguage/Technical Decision Making Process">Technical Decision Making Process</a><span style="display:none"><a href="/wiki/Technical_Decision_Making_Process" class="mw-redirect" title="Technical Decision Making Process"> </a></span></b> – read about the process to decide on making larger technical changes.</li> <li><b><a href="/wiki/Special:MyLanguage/Manual:Developing_libraries" title="Special:MyLanguage/Manual:Developing libraries">Developing libraries</a><span style="display:none"><a href="/wiki/Manual:Developing_libraries" title="Manual:Developing libraries"> </a></span></b> – a guide to packaging third-party libraries for use with MediaWiki.</li></ul></div></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r6969224" /> <div class="wiki-template-infocard"> <h3 id="Debugging_and_testing" class="wiki-template-infocard-title" data-mw-thread-id="h-Debugging_and_testing-Key_documents"><span data-mw-comment-start="" id="h-Debugging_and_testing-Key_documents"></span>Debugging and testing<span data-mw-comment-end="h-Debugging_and_testing-Key_documents"></span></h3> <div class="wiki-template-infocard-content"> <ul><li><b><a href="/wiki/Special:MyLanguage/Manual:How_to_debug" title="Special:MyLanguage/Manual:How to debug">How to debug</a></b> – a guide to debugging MediaWiki.</li> <li><b><a href="/wiki/Special:MyLanguage/Manual:Errors_and_symptoms" title="Special:MyLanguage/Manual:Errors and symptoms">Errors and symptoms</a><span style="display:none"><a href="/wiki/Manual:Errors_and_symptoms" class="mw-redirect" title="Manual:Errors and symptoms"> </a></span></b> – an overview of common MediaWiki errors and their correlating symptoms.</li> <li><b><a href="/wiki/Special:MyLanguage/Selenium" title="Special:MyLanguage/Selenium">Browser testing</a><span style="display:none"><a href="/wiki/Selenium" title="Selenium"> </a></span></b> – learn to write UI tests for MediaWiki using Selenium.</li> <li><b><a href="/wiki/Special:MyLanguage/Manual:Unit_testing" title="Special:MyLanguage/Manual:Unit testing">Unit testing</a></b> – learn to write unit tests for MediaWiki using PHPUnit.</li> <li><b><a href="/wiki/Special:MyLanguage/MediaWiki_API_Integration_Tests" title="Special:MyLanguage/MediaWiki API Integration Tests">API integration tests</a><span style="display:none"><a href="/wiki/MediaWiki_API_Integration_Tests" class="mw-redirect" title="MediaWiki API Integration Tests"> </a></span></b> – learn to write API integration tests for MediaWiki using Mocha.</li> <li><b><a href="/wiki/Special:MyLanguage/Security_for_developers" title="Special:MyLanguage/Security for developers">Security for developers</a><span style="display:none"><a href="/wiki/Security_for_developers" title="Security for developers"> </a></span></b> – learn how to write secure code.</li></ul></div></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r6969224" /> <div class="wiki-template-infocard"> <h3 id="Architecture" class="wiki-template-infocard-title" data-mw-thread-id="h-Architecture-Key_documents"><span data-mw-comment-start="" id="h-Architecture-Key_documents"></span>Architecture<span data-mw-comment-end="h-Architecture-Key_documents"></span></h3> <div class="wiki-template-infocard-content"> <ul><li><b><a href="/wiki/Special:MyLanguage/Manual:MediaWiki_architecture" title="Special:MyLanguage/Manual:MediaWiki architecture">MediaWiki architecture</a><span style="display:none"><a href="/wiki/Manual:MediaWiki_architecture" title="Manual:MediaWiki architecture"> </a></span></b> – an introduction to MediaWiki's architecture.</li> <li><b><a href="/wiki/Special:MyLanguage/Manual:Code" title="Special:MyLanguage/Manual:Code">Code</a><span style="display:none"><a href="/wiki/Manual:Code" title="Manual:Code"> </a></span></b> – an overview of the key parts of MediaWiki's source code.</li> <li><b><a href="/wiki/Special:MyLanguage/Manual:Database_layout" title="Special:MyLanguage/Manual:Database layout">Database layout</a><span style="display:none"><a href="/wiki/Manual:Database_layout" title="Manual:Database layout"> </a></span></b> – an overview of MediaWiki's database schemas.</li> <li><b><a href="/wiki/Special:MyLanguage/Manual:Global_object_variables" title="Special:MyLanguage/Manual:Global object variables">Global object variables</a><span style="display:none"><a href="/wiki/Manual:Global_object_variables" title="Manual:Global object variables"> </a></span></b> – a partial list of key global variables.</li> <li><b><a href="/wiki/Special:MyLanguage/Localisation" title="Special:MyLanguage/Localisation">Localisation</a><span style="display:none"><a href="/wiki/Localisation" title="Localisation"> </a></span></b> – learn about MediaWiki's internationalisation system.</li> <li><b><a href="/wiki/Special:MyLanguage/Manual:Contents" title="Special:MyLanguage/Manual:Contents">Manual</a></b> namespace on this wiki – documentation for developers.</li> <li><b><a class="external text" href="https://doc.wikimedia.org/mediawiki-core/master/php/">MediaWiki Class Reference</a></b> – technical documentation generated from the MediaWiki source code. (<b>Note:</b> The class reference is a large, slow-to-load page.)</li></ul></div></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r6969224" /> <div class="wiki-template-infocard"> <h3 id="Sub-systems" class="wiki-template-infocard-title" data-mw-thread-id="h-Sub-systems-Key_documents"><span data-mw-comment-start="" id="h-Sub-systems-Key_documents"></span>Sub-systems<span data-mw-comment-end="h-Sub-systems-Key_documents"></span></h3> <div class="wiki-template-infocard-content"> <ul><li><b><a href="/wiki/Special:MyLanguage/API:Main_page" title="Special:MyLanguage/API:Main page">API</a></b> – MediaWiki's API provides direct, high-level access to the data contained in the MediaWiki databases.</li> <li><b><a href="/wiki/Special:MyLanguage/Manual:ContentHandler" title="Special:MyLanguage/Manual:ContentHandler">ContentHandler</a><span style="display:none"><a href="/wiki/Manual:ContentHandler" title="Manual:ContentHandler"> </a></span></b> – MediaWiki's framework for supporting custom types of page content.</li> <li><b><a href="/wiki/Special:MyLanguage/Manual:Database_access" title="Special:MyLanguage/Manual:Database access">Database access</a><span style="display:none"><a href="/wiki/Manual:Database_access" title="Manual:Database access"> </a></span></b> – an overview of using databases in MediaWiki, including a brief guide to the database abstraction layer.</li> <li><b><a href="/wiki/Special:MyLanguage/Manual:Job_queue" title="Special:MyLanguage/Manual:Job queue">Job queue</a><span style="display:none"><a href="/wiki/Manual:Job_queue" title="Manual:Job queue"> </a></span></b> – MediaWiki's framework for processing long-running tasks asynchronously.</li> <li><b><a href="/wiki/Special:MyLanguage/Manual:Messages_API" title="Special:MyLanguage/Manual:Messages API">Messages API</a><span style="display:none"><a href="/wiki/Manual:Messages_API" title="Manual:Messages API"> </a></span></b> – MediaWiki's framework for providing localized application messages with PHP or JavaScript.</li></ul></div></div></div> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Extending_MediaWiki" data-mw-thread-id="h-Extending_MediaWiki"><span data-mw-comment-start="" id="h-Extending_MediaWiki"></span>Extending MediaWiki<span data-mw-comment-end="h-Extending_MediaWiki"></span></h2></div> <p>MediaWiki has been designed to allow for modification without changing the core code. This makes it easy to update to a new version of MediaWiki without having to manually merge in old extension code changes. There are several <a href="/wiki/Special:MyLanguage/Manual:Developing_extensions#Extension_points" title="Special:MyLanguage/Manual:Developing extensions">extension points</a><span style="display:none"><a href="/wiki/Manual:Developing_extensions#Extension_points" title="Manual:Developing extensions"> </a></span> that allow developers to change or extend what MediaWiki can do. </p> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r6713801" /> <div class="tpl-contentgrid" style=""><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r6969224" /> <div class="wiki-template-infocard"> <h3 id="Help_for_extension_developers" class="wiki-template-infocard-title" data-mw-thread-id="h-Help_for_extension_developers-Extending_MediaWiki"><span data-mw-comment-start="" id="h-Help_for_extension_developers-Extending_MediaWiki"></span>Help for extension developers<span data-mw-comment-end="h-Help_for_extension_developers-Extending_MediaWiki"></span></h3> <div class="wiki-template-infocard-content"> <ul><li><b><a href="/wiki/Special:MyLanguage/Manual:Developing_extensions" title="Special:MyLanguage/Manual:Developing extensions">Developing extensions</a><span style="display:none"><a href="/wiki/Manual:Developing_extensions" title="Manual:Developing extensions"> </a></span></b> – a guide to developing extensions.</li> <li><b><a href="/wiki/Special:MyLanguage/Extensions_FAQ" title="Special:MyLanguage/Extensions FAQ">Extensions FAQ</a><span style="display:none"><a href="/wiki/Extensions_FAQ" title="Extensions FAQ"> </a></span></b></li> <li>See <a href="/wiki/Special:MyLanguage/Category:Extensions" title="Special:MyLanguage/Category:Extensions">Category:Extensions</a><span style="display:none"><a href="/wiki/Category:Extensions" title="Category:Extensions"> </a></span>, for a list of extensions.</li> <li><b><a href="/wiki/Special:MyLanguage/Extension:BoilerPlate" title="Special:MyLanguage/Extension:BoilerPlate">Extension:BoilerPlate</a><span style="display:none"><a href="/wiki/Extension:BoilerPlate" title="Extension:BoilerPlate"> </a></span></b> – a blank extension template.</li></ul></div></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r6969224" /> <div class="wiki-template-infocard"> <h3 id="Help_for_skin_developers" class="wiki-template-infocard-title" data-mw-thread-id="h-Help_for_skin_developers-Extending_MediaWiki"><span data-mw-comment-start="" id="h-Help_for_skin_developers-Extending_MediaWiki"></span>Help for skin developers<span data-mw-comment-end="h-Help_for_skin_developers-Extending_MediaWiki"></span></h3> <div class="wiki-template-infocard-content"> <ul><li><b><a href="/wiki/Special:MyLanguage/Manual:How_to_make_a_MediaWiki_skin" title="Special:MyLanguage/Manual:How to make a MediaWiki skin">How to make a MediaWiki skin</a><span style="display:none"><a href="/wiki/Manual:How_to_make_a_MediaWiki_skin" title="Manual:How to make a MediaWiki skin"> </a></span></b> – instructions on how to create a skin for MediaWiki.</li> <li><b><a href="/wiki/Special:MyLanguage/Manual:Skin_configuration" title="Special:MyLanguage/Manual:Skin configuration">Skin configuration</a><span style="display:none"><a href="/wiki/Manual:Skin_configuration" title="Manual:Skin configuration"> </a></span></b> – a guide to configuring skins for a wiki.</li></ul></div></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r6969224" /> <div class="wiki-template-infocard"> <h3 id="Help_for_gadget_developers" class="wiki-template-infocard-title" data-mw-thread-id="h-Help_for_gadget_developers-Extending_MediaWiki"><span data-mw-comment-start="" id="h-Help_for_gadget_developers-Extending_MediaWiki"></span>Help for gadget developers<span data-mw-comment-end="h-Help_for_gadget_developers-Extending_MediaWiki"></span></h3> <div class="wiki-template-infocard-content"> <ul><li><b><a href="/wiki/Special:MyLanguage/Gadget_kitchen" title="Special:MyLanguage/Gadget kitchen">Gadget kitchen</a><span style="display:none"><a href="/wiki/Gadget_kitchen" title="Gadget kitchen"> </a></span></b> – a guide to developing user scripts and gadgets on wiki.</li></ul></div></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r6969224" /> <div class="wiki-template-infocard"> <h3 id="Help_for_module_developers" class="wiki-template-infocard-title" data-mw-thread-id="h-Help_for_module_developers-Extending_MediaWiki"><span data-mw-comment-start="" id="h-Help_for_module_developers-Extending_MediaWiki"></span>Help for module developers<span data-mw-comment-end="h-Help_for_module_developers-Extending_MediaWiki"></span></h3> <div class="wiki-template-infocard-content"> <ul><li><b><a href="/wiki/Special:MyLanguage/Extension:Scribunto/Lua_reference_manual" title="Special:MyLanguage/Extension:Scribunto/Lua reference manual">Scribunto/Lua reference manual</a><span style="display:none"><a href="/wiki/Extension:Scribunto/Lua_reference_manual" title="Extension:Scribunto/Lua reference manual"> </a></span></b> – documentation for developing Lua modules on wiki.</li> <li><a href="/wiki/Special:MyLanguage/Extension:Scribunto" title="Special:MyLanguage/Extension:Scribunto">Extension:Scribunto</a><span style="display:none"><a href="/wiki/Extension:Scribunto" title="Extension:Scribunto"> </a></span> – about the Scribunto extension.</li></ul></div></div></div> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Notes" data-mw-thread-id="h-Notes"><span data-mw-comment-start="" id="h-Notes"></span>Notes<span data-mw-comment-end="h-Notes"></span></h2></div> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text">Not all of MediaWiki is written in PHP. Some supporting tools are written in other languages, including <a href="https://en.wikipedia.org/wiki/Batch_files" class="extiw" title="w:Batch files">batch files</a>, <a href="https://en.wikipedia.org/wiki/Shell_script" class="extiw" title="w:Shell script">shell scripts</a>, <a href="https://en.wikipedia.org/wiki/Makefile" class="extiw" title="w:Makefile">makefiles</a> and <a href="https://en.wikipedia.org/wiki/Python_(programming_language)" class="extiw" title="w:Python (programming language)">Python</a>.</span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><a href="#cite_ref-2">↑</a></span> <span class="reference-text">MediaWiki runs on most platforms that can support PHP, however, the lack of certain utilities or operating system features may limit the functionality or performance of MediaWiki on non-LAMP platforms.</span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><a href="#cite_ref-3">↑</a></span> <span class="reference-text">MediaWiki has support for <a href="https://en.wikipedia.org/wiki/DBMS" class="extiw" title="w:DBMS">DBMS</a> other than <a href="https://en.wikipedia.org/wiki/MySQL" class="extiw" title="w:MySQL">MySQL</a> and <a href="https://en.wikipedia.org/wiki/MariaDB" class="extiw" title="w:MariaDB">MariaDB</a>, including <a href="https://en.wikipedia.org/wiki/PostgreSQL" class="extiw" title="w:PostgreSQL">PostgreSQL</a> and <a href="https://en.wikipedia.org/wiki/SQLite" class="extiw" title="w:SQLite">SQLite</a>.</span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><a href="#cite_ref-4">↑</a></span> <span class="reference-text">Developers are a mix of volunteers and paid staff (or contractors) for various organizations. For a full list of who works on the MediaWiki code, read the <a href="/wiki/Special:MyLanguage/Developers" title="Special:MyLanguage/Developers">Developers</a><span style="display:none"><a href="/wiki/Developers" title="Developers"> </a></span> article.</span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><a href="#cite_ref-5">↑</a></span> <span class="reference-text"> Browse the source code and revisions of code repositories in <a class="external text" href="https://gerrit.wikimedia.org/g/">Gerrit</a> or download the source code to your system by using <a href="/wiki/Special:MyLanguage/Gerrit" title="Special:MyLanguage/Gerrit">Gerrit</a><span style="display:none"><a href="/wiki/Gerrit" title="Gerrit"> </a></span>.</span> </li> </ol></div>    </div><noscript><img src="https://auth.wikimedia.org/loginwiki/wiki/Special:CentralAutoLogin/start?useformat=desktop&type=1x1&usesul3=1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://www.mediawiki.org/w/index.php?title=Developer_hub&oldid=7278174">https://www.mediawiki.org/w/index.php?title=Developer_hub&oldid=7278174</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Special:Categories" title="Special:Categories">Categories</a>: <ul><li><a href="/wiki/Category:MediaWiki_development" title="Category:MediaWiki development">MediaWiki development</a></li><li><a href="/wiki/Category:New_contributors" title="Category:New contributors">New contributors</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 13 March 2025, at 22:35.</li> <li id="footer-info-copyright">Text is available under the <a rel="nofollow" class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/">Creative Commons Attribution-ShareAlike License</a>; additional terms may apply. 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