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.mw-collapsible-header,.mw-parser-output .ext-infobox .mw-collapsible-toggle{font-weight:bold}.mw-parser-output .ext-infobox .mw-collapsible-content{margin-top:.2em;padding-top:.2em}.mw-parser-output .ext-infobox-header>th,.mw-parser-output .ext-infobox caption,.mw-parser-output .ext-infobox-image,.mw-parser-output .ext-infobox-translate{text-align:center}.mw-parser-output .ext-infobox-name{font-size:130%;line-height:100%}.mw-parser-output .ext-infobox-type{min-width:7em}</style><style data-mw-deduplicate="TemplateStyles:r6424453">.mw-parser-output .ext-status-unstable,.mw-parser-output .ext-status-unstable td{border-color:#d33}.mw-parser-output .ext-status-unstable .ext-infobox-header{background-color:#d33;color:#fff}.mw-parser-output .ext-status-unstable .ext-infobox-header a{color:#fff}.mw-parser-output .ext-status-experimental,.mw-parser-output .ext-status-experimental td{border-color:#ff4500}.mw-parser-output .ext-status-experimental .ext-infobox-header{background-color:#ff4500;color:#FFF}.mw-parser-output .ext-status-experimental .ext-infobox-header a{color:#FFF}.mw-parser-output .ext-status-beta,.mw-parser-output .ext-status-beta td{border-color:#fc3}.mw-parser-output .ext-status-beta .ext-infobox-header{color:#000;background-color:#fc3}.mw-parser-output .ext-status-beta .ext-infobox-header a{color:#000}.mw-parser-output .ext-status-stable,.mw-parser-output .ext-status-stable td{border-color:#00af89}.mw-parser-output .ext-status-stable .ext-infobox-header{background-color:#068468;color:#FFF}.mw-parser-output .ext-status-stable .ext-infobox-header a{color:#fff}.mw-parser-output .ext-status-unmaintained,.mw-parser-output .ext-status-unmaintained td{border-color:#ac6600}.mw-parser-output .ext-status-unmaintained .ext-infobox-header{background-color:#ac6600;color:#FFF}.mw-parser-output .ext-status-unmaintained .ext-infobox-header a{color:#fff}</style> <table class="infobox infobox-ltr ext-infobox ext-status-stable"> <caption><b><a href="/wiki/Special:MyLanguage/Manual:Extensions" title="Special:MyLanguage/Manual:Extensions">MediaWiki extensions manual</a><span style="display:none"><a href="/wiki/Manual:Extensions" title="Manual:Extensions"> </a></span></b></caption> <tbody><tr class="infobox-header ext-infobox-header notheme"> <th colspan="2"><figure class="mw-halign-left" typeof="mw:File"><a href="/wiki/Special:MyLanguage/Template:Extension#Content" title="Special:MyLanguage/Template:Extension"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/1b/OOjs_UI_icon_advanced-invert.svg/40px-OOjs_UI_icon_advanced-invert.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/1b/OOjs_UI_icon_advanced-invert.svg/60px-OOjs_UI_icon_advanced-invert.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/1b/OOjs_UI_icon_advanced-invert.svg/80px-OOjs_UI_icon_advanced-invert.svg.png 2x" data-file-width="20" data-file-height="20" /></a><figcaption></figcaption></figure> <span class="ext-infobox-name">Variables</span><br /> <a href="/wiki/Special:MyLanguage/Extension_status" title="Special:MyLanguage/Extension status">Release status:</a><span style="display:none"><a href="/wiki/Extension_status" title="Extension status"> </a></span> stable</th> </tr> <tr> <td class="ext-infobox-type"><b><a href="/wiki/Special:MyLanguage/Template:Extension#type" title="Special:MyLanguage/Template:Extension">Implementation</a><span style="display:none"><a href="/wiki/Template:Extension#type" title="Template:Extension"> </a></span></b></td> <td><a href="/wiki/Special:MyLanguage/Manual:Parser_functions" title="Special:MyLanguage/Manual:Parser functions">Parser function</a><span style="display:none"><a href="/wiki/Manual:Parser_functions" title="Manual:Parser functions"> </a></span> </td></tr><tr> <td><b><a href="/wiki/Special:MyLanguage/Template:Extension#description" title="Special:MyLanguage/Template:Extension">Description</a><span style="display:none"><a href="/wiki/Template:Extension#description" title="Template:Extension"> </a></span></b></td> <td>Introduces parser functions for dealing with page-scoped variables.</td> </tr> <tr> <td><b><a href="/wiki/Special:MyLanguage/Template:Extension#username" title="Special:MyLanguage/Template:Extension">Author(s)</a><span style="display:none"><a href="/wiki/Template:Extension#username" title="Template:Extension"> </a></span></b></td> <td> <ul><li>Rob Adams,</li> <li>Tom Hempel,</li> <li>Xiloynaha,</li> <li><a href="/wiki/User:Danwe" title="User:Danwe">Daniel Werner</a>,</li> <li><a href="/wiki/User:MGChecker" title="User:MGChecker">MGChecker</a></li></ul></td> </tr> <tr> <td><b><a href="/wiki/Special:MyLanguage/Template:Extension#maintainer" title="Special:MyLanguage/Template:Extension">Maintainer(s)</a><span style="display:none"><a href="/wiki/Template:Extension#maintainer" title="Template:Extension"> </a></span></b></td> <td><a href="/wiki/User:MGChecker" title="User:MGChecker">MGChecker</a></td> </tr> <tr> <td><b><a href="/wiki/Special:MyLanguage/Template:Extension#version" title="Special:MyLanguage/Template:Extension">Latest version</a><span style="display:none"><a href="/wiki/Template:Extension#version" title="Template:Extension"> </a></span></b></td> <td>2.5.1 (2019-07-11)</td> </tr> <tr> <td><a href="/wiki/Special:MyLanguage/Template:Extension#mediawiki" title="Special:MyLanguage/Template:Extension"><b>MediaWiki</b></a><span style="display:none"><a href="/wiki/Template:Extension#mediawiki" title="Template:Extension"> </a></span></td> <td>1.29+ </td> </tr> <tr> <td><a href="/wiki/Special:MyLanguage/Template:Extension#php" title="Special:MyLanguage/Template:Extension"><b>PHP</b></a><span style="display:none"><a href="/wiki/Template:Extension#php" title="Template:Extension"> </a></span></td> <td>5.5+</td> </tr> <tr> <td><a href="/wiki/Special:MyLanguage/Template:Extension#needs-updatephp" title="Special:MyLanguage/Template:Extension"><abbr title="'php update.php' needed after installation"><b>Database changes</b></abbr></a><span style="display:none"><a href="/wiki/Template:Extension#needs-updatephp" title="Template:Extension"> </a></span></td> <td>No</td> </tr> <tr> <td><b><a href="/wiki/Special:MyLanguage/Template:Extension#license" title="Special:MyLanguage/Template:Extension">License</a><span style="display:none"><a href="/wiki/Template:Extension#license" title="Template:Extension"> </a></span></b></td> <td><a rel="nofollow" class="external text" href="//opensource.org/licenses/ISC">ISC License</a></td> </tr><tr> <td><b>Download</b></td> <td><div class="plainlinks"><a href="/wiki/Special:ExtensionDistributor/Variables" title="Special:ExtensionDistributor/Variables"><b>Download extension</b></a> <br />Git <sup>[<a href="/wiki/Special:MyLanguage/Download_from_Git" title="Special:MyLanguage/Download from Git">?</a>]</sup>: <ul><li><span class="plainlinks"><a rel="nofollow" class="external text" href="https://github.com/wikimedia/mediawiki-extensions-Variables/archive/master.tar.gz">Download Git master</a></span></li> <li><a href="https://gerrit.wikimedia.org/g/mediawiki/extensions/Variables" class="extiw" title="git:mediawiki/extensions/Variables">browse repository</a> (<a href="https://phabricator.wikimedia.org/diffusion/EVAR" class="extiw" title="phab:diffusion/EVAR">Phabricator</a> · <a rel="nofollow" class="external text" href="https://github.com/wikimedia/mediawiki-extensions-Variables">GitHub</a>)</li> <li><a href="https://gerrit.wikimedia.org/g/mediawiki/extensions/Variables/%2Blog/master" class="extiw" title="git:mediawiki/extensions/Variables/+log/master">commit history</a></li> <li><a rel="nofollow" class="external text" href="https://github.com/wikimedia/mediawiki-extensions-Variables/graphs/contributors">repository contributors (GitHub)</a></li> <li><a href="https://gerrit.wikimedia.org/r/q/project:mediawiki/extensions/Variables" class="extiw" title="gerrit:q/project:mediawiki/extensions/Variables">code review</a></li></ul></div><br /><a href="https://gerrit.wikimedia.org/g/mediawiki/extensions/Variables/%2B/HEAD/README" class="extiw" title="git:mediawiki/extensions/Variables/+/HEAD/README">README</a><br /><a href="https://gerrit.wikimedia.org/g/mediawiki/extensions/Variables/%2B/HEAD/RELEASE-NOTES" class="extiw" title="git:mediawiki/extensions/Variables/+/HEAD/RELEASE-NOTES">RELEASE-NOTES</a></td> </tr> <tr> <td class="mw-collapsible mw-collapsed" colspan="2"> <div class="mw-collapsible-header"><a href="/wiki/Special:MyLanguage/Template:Extension#parameters" title="Special:MyLanguage/Template:Extension">Parameters</a><span style="display:none"><a href="/wiki/Template:Extension#parameters" title="Template:Extension"> </a></span></div> <div class="mw-collapsible-content"> <ul><li><span class="configvariable">$wgVariablesAreVolatile</span></li> <li><span class="configvariable">$wgVariablesDisabledFunctions</span></li></ul></div></td> </tr> <tr> <td class="mw-collapsible mw-collapsed" colspan="2"> <div class="mw-collapsible-header"><a href="/wiki/Special:MyLanguage/Template:Extension#hook" title="Special:MyLanguage/Template:Extension">Hooks used</a><span style="display:none"><a href="/wiki/Template:Extension#hook" title="Template:Extension"> </a></span></div> <style data-mw-deduplicate="TemplateStyles:r6219282">.mw-parser-output .plainlist ul{line-height:inherit;list-style:none none;margin:0}.mw-parser-output .plainlist ul li{margin-bottom:0}</style><div class="plainlist mw-collapsible-content"><ul><li><a href="/wiki/Special:MyLanguage/Manual:Hooks/ParserClearState" title="Special:MyLanguage/Manual:Hooks/ParserClearState">ParserClearState</a><span style="display:none"><a href="/wiki/Manual:Hooks/ParserClearState" title="Manual:Hooks/ParserClearState"> </a></span></li><li><a href="/wiki/Special:MyLanguage/Manual:Hooks/ParserFirstCallInit" title="Special:MyLanguage/Manual:Hooks/ParserFirstCallInit">ParserFirstCallInit</a><span style="display:none"><a href="/wiki/Manual:Hooks/ParserFirstCallInit" title="Manual:Hooks/ParserFirstCallInit"> </a></span></li></ul></div> </td> </tr> <tr> <td title="This only includes downloads from Special:ExtensionDistributor. Other download methods such as git or bundled extensions are not included."><b>Quarterly downloads</b></td> <td>79 (Ranked 66<sup>th</sup>)</td> </tr> <tr> <td title=""><a rel="nofollow" class="external text" href="https://wikiapiary.com/wiki/Extension:Variables"><b>Public wikis using</b></a></td> <td>1,808 (Ranked 201<sup>st</sup>)</td> </tr> <tr> <td colspan="2" class="ext-infobox-translate"> <a href="https://translatewiki.net/wiki/Special:Translate/ext-variables" class="extiw" title="translatewiki:Special:Translate/ext-variables">Translate the Variables extension</a> if it is available at translatewiki.net</td> </tr><tr class="mw-empty-elt"> </tr> <tr> <td><b><a href="/wiki/Special:MyLanguage/MediaWiki-Vagrant#Using_roles" title="Special:MyLanguage/MediaWiki-Vagrant">Vagrant role</a><span style="display:none"><a href="/wiki/MediaWiki-Vagrant#Using_roles" title="MediaWiki-Vagrant"> </a></span></b></td> <td><a class="external text" href="https://doc.wikimedia.org/mediawiki-vagrant/puppet_classes/role_3A_3Avariables.html">variables</a></td> </tr> <tr> <td> <b><a href="/wiki/Special:MyLanguage/Phabricator" title="Special:MyLanguage/Phabricator">Issues</a><span style="display:none"><a href="/wiki/Phabricator" title="Phabricator"> </a></span></b></td> <td><a href="https://phabricator.wikimedia.org/tag/mediawiki-extensions-variables" class="extiw" title="phab:tag/mediawiki-extensions-variables">Open tasks</a> · <a class="external text" href="https://phabricator.wikimedia.org/maniphest/task/create/?projects=mediawiki-extensions-variables">Report a bug</a></td> </tr> </tbody></table> <table class="warning-message" style="background-color: var( --background-color-error-subtle, #ffe9e5 ); color: var( --color-base, #202122 ); border: 1px var( --border-color-error, #9f3526 ) solid; box-sizing: border-box; margin: 0.5em 0; padding: 0.5em;"><tbody><tr><td style="white-space: nowrap; vertical-align: top;"><span style="position: relative; top: -2px;"><span typeof="mw:File"><span><img alt="Warning" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/bf/OOjs_UI_icon_notice-destructive.svg/18px-OOjs_UI_icon_notice-destructive.svg.png" decoding="async" width="18" height="18" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/bf/OOjs_UI_icon_notice-destructive.svg/27px-OOjs_UI_icon_notice-destructive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/bf/OOjs_UI_icon_notice-destructive.svg/36px-OOjs_UI_icon_notice-destructive.svg.png 2x" data-file-width="20" data-file-height="20" /></span></span></span> <b>Warning:</b> </td><td style="padding-left: 0.5em vertical-align: top;">This extension is incompatible with plans to parallelize parsing, as is intended by the use of <a href="/wiki/Special:MyLanguage/Parsoid" title="Special:MyLanguage/Parsoid">Parsoid</a><span style="display:none"><a href="/wiki/Parsoid" title="Parsoid"> </a></span>. Therefore, the future of this extension is uncertain, and it is expected to become incompatible with the standard MediaWiki parser within a few years. For further information, see <a href="https://phabricator.wikimedia.org/T250963" class="extiw" title="phabricator:T250963">task T250963</a> and <a href="/wiki/Special:MyLanguage/Parsoid/Extension_API#No_support_for_sequential,_in-order_processing_of_extension_tags" title="Special:MyLanguage/Parsoid/Extension API">No support for sequential, in-order processing of extension tags</a><span style="display:none"><a href="/wiki/Parsoid/Extension_API#No_support_for_sequential,_in-order_processing_of_extension_tags" title="Parsoid/Extension API"> </a></span>.</td></tr></tbody></table> <style data-mw-deduplicate="TemplateStyles:r6651107">.mw-parser-output .note{background-position:left 7px top 50%;padding:0.5em 0.5em 0.5em 40px;margin:0.5em 0;overflow:hidden;background-color:#f8f9fa;color:#333;background-repeat:no-repeat;border:1px solid #ddd}.mw-parser-output .note-inline{display:inline-block;vertical-align:middle}.mw-parser-output .note-info{background-color:#eaf3ff;color:#333;background-image:url("https://upload.wikimedia.org/wikipedia/commons/e/ec/OOjs_UI_icon_information-progressive.svg");background-size:25px;border-color:#a3caff;padding-left:40px;min-height:25px}.mw-parser-output .note-reminder{background-color:#fff9ea;color:#333;background-image:url("https://upload.wikimedia.org/wikipedia/commons/a/a8/OOjs_UI_icon_lightbulb-yellow.svg");background-size:25px;border-color:#fc3;min-height:25px}.mw-parser-output .note-warn{background-color:#fff9ea;color:#333;background-image:url("https://upload.wikimedia.org/wikipedia/commons/3/3b/OOjs_UI_icon_alert-warning.svg");background-size:25px;border-color:#fc3;min-height:25px}.mw-parser-output .note-error{background-color:#fee7e6;color:#333;background-image:url("https://upload.wikimedia.org/wikipedia/commons/b/bf/OOjs_UI_icon_notice-destructive.svg");background-size:25px;border-color:#c33;min-height:25px}@media screen{html.skin-theme-clientpref-night .mw-parser-output .note{background-color:transparent;color:inherit}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .note{background-color:transparent;color:inherit}}</style><div role="note" class="note note-warn">To avoid deprecation warning about the <code>InternalParseBeforeSanitize</code> hook for <a href="/wiki/Special:MyLanguage/MediaWiki_1.35" title="Special:MyLanguage/MediaWiki 1.35">MediaWiki 1.35</a><span style="display:none"><a href="/wiki/MediaWiki_1.35" title="MediaWiki 1.35"> </a></span> - <a href="/wiki/Special:MyLanguage/MediaWiki_1.38" title="Special:MyLanguage/MediaWiki 1.38">MediaWiki 1.38</a><span style="display:none"><a href="/wiki/MediaWiki_1.38" title="MediaWiki 1.38"> </a></span>, or missing the <code><a href="##var_final">#var_final</a></code> parser function in <a href="/wiki/Special:MyLanguage/MediaWiki_1.39" title="Special:MyLanguage/MediaWiki 1.39">MediaWiki 1.39</a><span style="display:none"><a href="/wiki/MediaWiki_1.39" title="MediaWiki 1.39"> </a></span>+, please update to the latest version (<code>master</code> branch for now). See <a href="https://phabricator.wikimedia.org/T276627" class="extiw" title="phabricator:T276627">task T276627</a> and <a href="https://phabricator.wikimedia.org/T250963" class="extiw" title="phabricator:T250963">task T250963</a> for further information.</div> <p>The <b>Variables</b> extension allows you to define a variable on a page, use it later in that same page or included templates, change its value, possibly to a value given by an expression in terms of the old value, etc. </p><p>It is much like a template, only very lightweight and scoped to only a single page, so you can use many variables on a page without slowing down the wiki with huge numbers of templates. Combine this extension with the <a href="/wiki/Special:MyLanguage/Extension:ParserFunctions" title="Special:MyLanguage/Extension:ParserFunctions">ParserFunctions</a><span style="display:none"><a href="/wiki/Extension:ParserFunctions" title="Extension:ParserFunctions"> </a></span> extension for best results. </p> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r6651107"><div role="note" class="note note-info">This extension will not be enabled for wikis run by the Wikimedia Foundation (WMF).<sup id="cite_ref-T9865_1-0" class="reference"><a href="#cite_note-T9865-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-T65324_2-0" class="reference"><a href="#cite_note-T65324-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-T113859_3-0" class="reference"><a href="#cite_note-T113859-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-T151192_4-0" class="reference"><a href="#cite_note-T151192-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> See <a href="#Alternatives">alternatives</a>.</div> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Assigning_a_value_to_a_variable">Assigning a value to a variable</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Extension:Variables&action=edit&section=1" title="Edit section: Assigning a value to a variable"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="#vardefine"><span id=".23vardefine"></span><code>#vardefine</code></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Extension:Variables&action=edit&section=2" title="Edit section: #vardefine"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><code>{{#vardefine:<i>variablename</i> | <i>specifiedvalue</i> }}</code></li></ul> <p>Assigns the value <i>specifiedvalue</i> to the (already existing or hereby introduced) variable <i>variablename</i>. </p> <ul><li><i>Example: <code>{{#vardefine:iconwidth|25}}</code> making <code>iconwidth = 25</code></i></li></ul> <div class="mw-heading mw-heading3"><h3 id="#vardefineecho"><span id=".23vardefineecho"></span><code>#vardefineecho</code></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Extension:Variables&action=edit&section=3" title="Edit section: #vardefineecho"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><code>{{#vardefineecho:<i>variablename</i> | <i>specifiedvalue</i> }}</code></li></ul> <p>Works exactly as <code>#vardefine</code>, but the affected value is printed. </p> <ul><li><i>Example: making <code>iconwidth = {{#vardefineecho:iconwidth|25}}</code></i></li></ul> <div class="mw-heading mw-heading2"><h2 id="Retrieving_the_value_of_a_variable">Retrieving the value of a variable</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Extension:Variables&action=edit&section=4" title="Edit section: Retrieving the value of a variable"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="#var"><span id=".23var"></span><code>#var</code></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Extension:Variables&action=edit&section=5" title="Edit section: #var"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The value of the variable <i>variablename</i> is produced by </p> <ul><li><code>{{#var:<i>variablename</i>}}</code></li></ul> <p>If undefined, this produces an empty string; it does not give an error message. </p><p>It is possible to get a default value for the case that the variable is undefined or void: </p> <ul><li><code>{{#var:<i>variablename</i> | <i>defaultvalue</i> }}</code></li></ul> <p>This is equivalent to: </p> <ul><li><code>{{#if: {{#var:<i>variablename</i> }} | {{#var:<i>variablename</i> }} | <i>defaultvalue</i> }}</code></li></ul> <p>but it is much shorter and better arranged. Before version 2.0 though, the default value always was expanded. From version 2.0 on the default only gets expanded in case it is actually used. </p><p>The value can be used in parser functions, etc. </p> <div class="mw-heading mw-heading3"><h3 id="#varexists"><span id=".23varexists"></span><code>#varexists</code></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Extension:Variables&action=edit&section=6" title="Edit section: #varexists"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><code>{{#varexists:<i>variablename</i> }}</code> returns <i>1</i> if the variable is already defined. If the variable is not defined the return value is void.</li></ul> <p>It supports a second and a third parameter to replace these values. </p> <ul><li><code>{{#varexists:<i>variablename</i> | <i>if-value</i> | <i>else-value</i> }}</code></li></ul> <p>This is equivalent to: </p> <ul><li><code>{{#if: {{#varexists: <i>variablename</i> }} | <i>if-value</i> | <i>else-value</i> }}</code></li></ul> <p>but it is much shorter and better arranged. Before version 2.5 though, both were always expanded. From version 2.5 on the if and else values only get expanded when their cases are actually entered. </p> <div class="mw-heading mw-heading3"><h3 id="#var_final"><span id=".23var_final"></span><code>#var_final</code></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Extension:Variables&action=edit&section=7" title="Edit section: #var_final"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Experimental function introduced in Variables 2.0. This function will output the final, last value a variable has at the end of the page rendering. Naturally, the value will be inserted after the parser went over the entire wiki markup, so this function can't be used in other functions, expecting the right value is being used. Example: </p> <ul><li><code>{{#var_final:<i>variablename</i> | <i>defaultvalue</i> }}</code></li></ul> <p>The <i>default</i> value will be used if the variable doesn't exist at the final page rendering stage or if its value is an empty string. The default will be expanded right where the function is used, so the parameter will be expanded, even if it won't be needed. </p> <div class="mw-heading mw-heading2"><h2 id="Examples">Examples</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Extension:Variables&action=edit&section=8" title="Edit section: Examples"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><i>The <a href="/wiki/Special:MyLanguage/Extension:ParserFunctions" title="Special:MyLanguage/Extension:ParserFunctions">ParserFunctions</a><span style="display:none"><a href="/wiki/Extension:ParserFunctions" title="Extension:ParserFunctions"> </a></span> extension must also be installed to use <code>#expr</code>.</i> </p><p>Compute <code>x = 2*a + b</code>: </p> <ul><li><code>{{#vardefine:x|{{#expr:2*{{#var:a}}+{{#var:b}}}}}}</code></li></ul> <p>Add one to <i>n</i>: </p> <ul><li><code>{{#vardefine:n|{{#expr:{{#var:n}}+1}}}}</code></li></ul> <div class="mw-heading mw-heading2"><h2 id="Installation">Installation</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Extension:Variables&action=edit&section=9" title="Edit section: Installation"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Special:ExtensionDistributor/Variables" title="Special:ExtensionDistributor/Variables">Download</a> and move the extracted <code>Variables</code> folder to your <code>extensions/</code> directory.<br />Developers and code contributors should install the extension <a href="/wiki/Special:MyLanguage/Download_from_Git" title="Special:MyLanguage/Download from Git">from Git</a> instead, using:<code class="mw-code mw-highlight" style="display:block">cd extensions/<br />git clone https://gerrit.wikimedia.org/r/mediawiki/extensions/Variables</code></li> <li>Add the following code at the bottom of your <a href="/wiki/Special:MyLanguage/Manual:LocalSettings.php" title="Special:MyLanguage/Manual:LocalSettings.php">LocalSettings.php</a><span style="display:none"><a href="/wiki/Manual:LocalSettings.php" title="Manual:LocalSettings.php"> </a></span> file: <div class="mw-highlight mw-highlight-lang-php mw-content-ltr" dir="ltr"><pre><span></span><span class="nx">wfLoadExtension</span><span class="p">(</span> <span class="s1">'Variables'</span> <span class="p">);</span> </pre></div></li> <li><a href="#Configuration">Configure as required</a></li> <li><span typeof="mw:File"><span><img alt="Yes" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f6/OOjs_UI_icon_check-constructive.svg/15px-OOjs_UI_icon_check-constructive.svg.png" decoding="async" width="15" height="15" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f6/OOjs_UI_icon_check-constructive.svg/23px-OOjs_UI_icon_check-constructive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f6/OOjs_UI_icon_check-constructive.svg/30px-OOjs_UI_icon_check-constructive.svg.png 2x" data-file-width="20" data-file-height="20" /></span></span> <b>Done</b> – Navigate to <a href="/wiki/Special:Version" title="Special:Version">Special:Version</a> on your wiki to verify that the extension is successfully installed.</li></ul> <div class="mw-heading mw-heading2"><h2 id="Configuration">Configuration</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Extension:Variables&action=edit&section=10" title="Edit section: Configuration"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>This extension provides two configuration parameters: </p> <dl><dt><code class="mw-highlight mw-highlight-lang-php mw-content-ltr" style="" dir="ltr"><span class="nv">$egVariablesAreVolatile</span></code></dt> <dd>Allows to disable the parser frame being marked as volatile by the extension, i.e. disable template caching.</dd> <dd>Default: <code>true;</code></dd> <dt><code class="mw-highlight mw-highlight-lang-php mw-content-ltr" style="" dir="ltr"><span class="nv">$egVariablesDisabledFunctions</span></code></dt> <dd>Allows to disable specified parser functions provided by this extension.</dd> <dd>Default: <code>[];</code></dd> <dd>Example: <code>[ 'var_final', 'vardefineecho' ];</code></dd></dl> <div class="mw-heading mw-heading2"><h2 id="Compatibility">Compatibility</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Extension:Variables&action=edit&section=11" title="Edit section: Compatibility"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The recommended version of the Variables extension for recent MediaWiki releases is listed below. Older versions of the extensions might work as well, but aren't tested for new MediaWiki releases. </p> <table class="wikitable plainlinks"> <tbody><tr> <th><a href="/wiki/Version_lifecycle" title="Version lifecycle">MediaWiki version</a></th> <th>Variables version </th></tr> <tr> <td>1.19–1.22</td> <td><a href="https://gerrit.wikimedia.org/g/mediawiki/extensions/Variables/%2B/v2.1.0" class="extiw" title="git:mediawiki/extensions/Variables/+/v2.1.0">2.1.x</a> </td></tr> <tr> <td>1.23–1.28</td> <td><a href="https://gerrit.wikimedia.org/g/mediawiki/extensions/Variables/%2B/v2.2.0" class="extiw" title="git:mediawiki/extensions/Variables/+/v2.2.0">2.2.x</a> </td></tr> <tr> <td>1.29–1.34</td> <td><a href="https://gerrit.wikimedia.org/g/mediawiki/extensions/Variables/%2B/v2.5.0" class="extiw" title="git:mediawiki/extensions/Variables/+/v2.5.0">2.5.x</a> </td></tr> <tr> <td>1.35–1.39</td> <td><a href="https://gerrit.wikimedia.org/g/mediawiki/extensions/Variables/%2B/v2.5.0" class="extiw" title="git:mediawiki/extensions/Variables/+/v2.5.0">2.5.x</a> (deprecated) </td></tr> <tr> <td>1.40+</td> <td><i>unsupported</i> (WIP) </td></tr></tbody></table> <p><br /> </p> <div class="mw-heading mw-heading2"><h2 id="Alternatives">Alternatives</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Extension:Variables&action=edit&section=12" title="Edit section: Alternatives"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>As this extension will not be enabled for wikis run by the Wikimedia Foundation (WMF), here are some alternatives:<sup id="cite_ref-T9865_1-1" class="reference"><a href="#cite_note-T9865-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-T65324_2-1" class="reference"><a href="#cite_note-T65324-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-T113859_3-1" class="reference"><a href="#cite_note-T113859-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-T151192_4-1" class="reference"><a href="#cite_note-T151192-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <ul><li>If you use Variables as cache for expensive operations, you can transform the section where you need them into a template and pass the required information as template parameters instead. This will work until you reach the <a href="/wiki/Manual:Template_limits#Expansion_depth" title="Manual:Template limits">expansion depth limit</a>, which can be increased if necessary.</li> <li>If you use Variables to do more complex template operations than possible with simple <a href="/wiki/Special:MyLanguage/Extension:ParserFunctions" title="Special:MyLanguage/Extension:ParserFunctions">Extension:ParserFunctions</a><span style="display:none"><a href="/wiki/Extension:ParserFunctions" title="Extension:ParserFunctions"> </a></span>, and if you have sufficient permissions on the server, you can use <a href="/wiki/Special:MyLanguage/Extension:Scribunto" title="Special:MyLanguage/Extension:Scribunto">Scribunto</a>'s Lua functionality instead. You may not be able to install Scribunto on shared hosting. Note that this does not add support for global Variables. However, <a href="/wiki/Special:MyLanguage/Extension:VariablesLua" title="Special:MyLanguage/Extension:VariablesLua">Extension:VariablesLua</a><span style="display:none"><a href="/wiki/Extension:VariablesLua" title="Extension:VariablesLua"> </a></span> adds a Scribunto interface for the Variables store.</li> <li>Don't use variables, instead duplicate the information you need as a variable. If that information is acquired by an expensive template call, performance may suffer. This will work until you reach the node count limit.</li> <li>If you require variables just for autonumbering, you could look into <a href="/wiki/Special:MyLanguage/Extension:NumerAlpha" title="Special:MyLanguage/Extension:NumerAlpha">Extension:NumerAlpha</a><span style="display:none"><a href="/wiki/Extension:NumerAlpha" title="Extension:NumerAlpha"> </a></span>.</li></ul> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Extension:Variables&action=edit&section=13" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Special:MyLanguage/Extension:PhpTags" title="Special:MyLanguage/Extension:PhpTags">Extension:PhpTags</a><span style="display:none"><a href="/wiki/Extension:PhpTags" title="Extension:PhpTags"> </a></span></li> <li><a href="/wiki/Special:MyLanguage/Extension:MyVariables" title="Special:MyLanguage/Extension:MyVariables">Extension:MyVariables</a><span style="display:none"><a href="/wiki/Extension:MyVariables" title="Extension:MyVariables"> </a></span> – Creates new <a href="/wiki/Special:MyLanguage/Help:Magic_words" title="Special:MyLanguage/Help:Magic words">variables</a> in the MediaWiki sense</li> <li><a href="/wiki/Special:MyLanguage/Extension:Loops" title="Special:MyLanguage/Extension:Loops">Extension:Loops</a><span style="display:none"><a href="/wiki/Extension:Loops" title="Extension:Loops"> </a></span> – Provides parser functions for performing loops</li> <li><a href="/wiki/Special:MyLanguage/Extension:Arrays" title="Special:MyLanguage/Extension:Arrays">Extension:Arrays</a><span style="display:none"><a href="/wiki/Extension:Arrays" title="Extension:Arrays"> </a></span> – Create an array and provide array functions (such as search, split, and sort) and set operations (such as intersect, union and diff)</li> <li><a href="/wiki/Special:MyLanguage/Extension:HashTables" title="Special:MyLanguage/Extension:HashTables">Extension:HashTables</a><span style="display:none"><a href="/wiki/Extension:HashTables" title="Extension:HashTables"> </a></span> – New parser functions for handling hash tables in MediaWiki</li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Extension:Variables&action=edit&section=14" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-T9865-1"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-T9865_1-0">1.0</a></sup> <sup><a href="#cite_ref-T9865_1-1">1.1</a></sup></span> <span class="reference-text"><a href="https://phabricator.wikimedia.org/T9865" class="extiw" title="phab:T9865">phab:T9865</a></span> </li> <li id="cite_note-T65324-2"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-T65324_2-0">2.0</a></sup> <sup><a href="#cite_ref-T65324_2-1">2.1</a></sup></span> <span class="reference-text"><a href="https://phabricator.wikimedia.org/T65324" class="extiw" title="phab:T65324">phab:T65324</a></span> </li> <li id="cite_note-T113859-3"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-T113859_3-0">3.0</a></sup> <sup><a href="#cite_ref-T113859_3-1">3.1</a></sup></span> <span class="reference-text"><a href="https://phabricator.wikimedia.org/T113859" class="extiw" title="phab:T113859">phab:T113859</a></span> </li> <li id="cite_note-T151192-4"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-T151192_4-0">4.0</a></sup> <sup><a href="#cite_ref-T151192_4-1">4.1</a></sup></span> <span class="reference-text"><a href="https://phabricator.wikimedia.org/T151192" class="extiw" title="phab:T151192">phab:T151192</a></span> </li> </ol></div> <style data-mw-deduplicate="TemplateStyles:r6651108">.mw-parser-output table.ombox{margin:4px 10%;border-collapse:collapse;border:1px solid #a2a9b1;background-color:#f8f9fa;color:#333;box-sizing:border-box}.mw-parser-output .ombox td.mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ombox th.mbox-text,.mw-parser-output .ombox td.mbox-text{border:none;padding:0.25em 0.9em;width:100%}.mw-parser-output .ombox td.mbox-image{border:none;text-align:center;padding:2px 0 2px 0.9em}.mw-parser-output .ombox td.mbox-imageright{border:none;text-align:center;padding:2px 0.9em 2px 0}.mw-parser-output table.ombox-notice{border-color:#a2a9b1}.mw-parser-output table.ombox-speedy{background-color:#fee7e6;color:#333}.mw-parser-output table.ombox-speedy,.mw-parser-output table.ombox-delete{border-color:#b32424;border-width:2px}.mw-parser-output table.ombox-content{border-color:#f28500}.mw-parser-output table.ombox-style{border-color:#fc3}.mw-parser-output table.ombox-move{border-color:#9932cc}.mw-parser-output table.ombox-protection{border-color:#a2a9b1;border-width:2px}html body.mediawiki .mw-parser-output .ombox.mbox-small{clear:right;float:right;margin:4px 0 4px 1em;box-sizing:border-box;width:238px;font-size:88%;line-height:1.25em}@media screen{html.skin-theme-clientpref-night .mw-parser-output table.ombox{background-color:transparent;color:inherit}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output table.ombox{background-color:transparent;color:inherit}}</style><table class="ombox ombox-notice" role="presentation"><tbody><tr><td class="mbox-image"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ec/OOjs_UI_icon_information-progressive.svg/40px-OOjs_UI_icon_information-progressive.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ec/OOjs_UI_icon_information-progressive.svg/60px-OOjs_UI_icon_information-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ec/OOjs_UI_icon_information-progressive.svg/80px-OOjs_UI_icon_information-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></span></span></td><td class="mbox-text">This extension is included in the following wiki farms/hosts and/or packages: <style data-mw-deduplicate="TemplateStyles:r6387430">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist ol ul,.mw-parser-output .hlist ul dl,.mw-parser-output .hlist ul ol,.mw-parser-output .hlist ul ul{display:inline}.mw-parser-output .hlist .mw-empty-li,.mw-parser-output .hlist .mw-empty-elt{display:none}.mw-parser-output .hlist dt:after{content:": "}.mw-parser-output .hlist dd:after,.mw-parser-output .hlist li:after{content:" · ";font-weight:bold}.mw-parser-output .hlist dd:last-child:after,.mw-parser-output .hlist dt:last-child:after,.mw-parser-output .hlist li:last-child:after{content:none}.mw-parser-output .hlist dd dd:first-child:before,.mw-parser-output .hlist dd dt:first-child:before,.mw-parser-output .hlist dd li:first-child:before,.mw-parser-output .hlist dt dd:first-child:before,.mw-parser-output .hlist dt dt:first-child:before,.mw-parser-output .hlist dt li:first-child:before,.mw-parser-output .hlist li dd:first-child:before,.mw-parser-output .hlist li dt:first-child:before,.mw-parser-output .hlist li li:first-child:before{content:" (";font-weight:normal}.mw-parser-output .hlist dd dd:last-child:after,.mw-parser-output .hlist dd dt:last-child:after,.mw-parser-output .hlist dd li:last-child:after,.mw-parser-output .hlist dt dd:last-child:after,.mw-parser-output .hlist dt dt:last-child:after,.mw-parser-output .hlist dt li:last-child:after,.mw-parser-output .hlist li dd:last-child:after,.mw-parser-output .hlist li dt:last-child:after,.mw-parser-output .hlist li li:last-child:after{content:")";font-weight:normal}.mw-parser-output .hlist ol{counter-reset:listitem}.mw-parser-output .hlist ol>li{counter-increment:listitem}.mw-parser-output .hlist ol>li:before{content:" "counter(listitem)"\a0 "}.mw-parser-output .hlist dd ol>li:first-child:before,.mw-parser-output .hlist dt ol>li:first-child:before,.mw-parser-output .hlist li ol>li:first-child:before{content:" ("counter(listitem)"\a0 "}</style><div class="hlist"> <ul><li><a href="/wiki/Special:MyLanguage/BlueSpice" title="Special:MyLanguage/BlueSpice">BlueSpice</a><span style="display:none"><a href="/wiki/BlueSpice" title="BlueSpice"> </a></span></li> <li><a href="/wiki/Special:MyLanguage/Canasta" title="Special:MyLanguage/Canasta">Canasta</a><span style="display:none"><a href="/wiki/Canasta" title="Canasta"> </a></span></li> <li><a href="/wiki/Special:MyLanguage/Fandom" title="Special:MyLanguage/Fandom">Fandom</a><span style="display:none"><a href="/wiki/Fandom" title="Fandom"> </a></span></li> <li><a href="/wiki/Special:MyLanguage/Miraheze" title="Special:MyLanguage/Miraheze">Miraheze</a><span style="display:none"><a href="/wiki/Miraheze" title="Miraheze"> </a></span></li> <li><a rel="nofollow" class="external text" href="https://open-csp.org/">Open CSP</a></li> <li><a rel="nofollow" class="external text" href="https://www.pro.wiki/">ProWiki</a></li> <li><a rel="nofollow" class="external text" href="https://semantic.wiki/de/core">semantic::core</a></li> <li><a rel="nofollow" class="external text" href="https://telepedia.net/">Telepedia</a></li> <li><a href="/wiki/Special:MyLanguage/wiki.gg" title="Special:MyLanguage/wiki.gg">wiki.gg</a><span style="display:none"><a href="/wiki/Wiki.gg" title="Wiki.gg"> </a></span></li> <li><a rel="nofollow" class="external text" href="https://wikiforge.net/">WikiForge</a></li></ul> </div> <small>This is not an authoritative list.</small> <small>Some wiki farms/hosts and/or packages may contain this extension even if they are not listed here.</small> <small>Always check with your wiki farms/hosts or bundle to confirm.</small></td></tr></tbody></table>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" 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=Extension:Variables&oldid=6656972">https://www.mediawiki.org/w/index.php?title=Extension:Variables&oldid=6656972</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:Stable_extensions" title="Category:Stable extensions">Stable extensions</a></li><li><a href="/wiki/Category:Parser_function_extensions" title="Category:Parser function extensions">Parser function extensions</a></li><li><a href="/wiki/Category:ISC_licensed_extensions" title="Category:ISC licensed extensions">ISC licensed extensions</a></li><li><a href="/wiki/Category:Extensions_in_Wikimedia_version_control" title="Category:Extensions in Wikimedia version control">Extensions in Wikimedia version control</a></li><li><a href="/wiki/Category:ParserClearState_extensions" title="Category:ParserClearState extensions">ParserClearState extensions</a></li><li><a href="/wiki/Category:ParserFirstCallInit_extensions" title="Category:ParserFirstCallInit extensions">ParserFirstCallInit extensions</a></li><li><a href="/wiki/Category:All_extensions" title="Category:All extensions">All extensions</a></li><li><a href="/wiki/Category:Extensions_included_in_BlueSpice" title="Category:Extensions included in BlueSpice">Extensions included in BlueSpice</a></li><li><a href="/wiki/Category:Extensions_included_in_Canasta" title="Category:Extensions included in Canasta">Extensions included in Canasta</a></li><li><a href="/wiki/Category:Extensions_included_in_Fandom" title="Category:Extensions included in Fandom">Extensions included in Fandom</a></li><li><a href="/wiki/Category:Extensions_included_in_Miraheze" title="Category:Extensions included in Miraheze">Extensions included in Miraheze</a></li><li><a href="/wiki/Category:Extensions_included_in_Open_CSP" title="Category:Extensions included in Open CSP">Extensions included in Open CSP</a></li><li><a href="/wiki/Category:Extensions_included_in_ProWiki" title="Category:Extensions included in ProWiki">Extensions included in ProWiki</a></li><li><a href="/wiki/Category:Extensions_included_in_semantic::core" title="Category:Extensions included in semantic::core">Extensions included in semantic::core</a></li><li><a href="/wiki/Category:Extensions_included_in_Telepedia" title="Category:Extensions included in Telepedia">Extensions included in Telepedia</a></li><li><a href="/wiki/Category:Extensions_included_in_wiki.gg" title="Category:Extensions included in wiki.gg">Extensions included in wiki.gg</a></li><li><a href="/wiki/Category:Extensions_included_in_WikiForge" title="Category:Extensions included in WikiForge">Extensions included in WikiForge</a></li><li><a href="/wiki/Category:Modifiable_variables_extensions" title="Category:Modifiable variables extensions">Modifiable variables extensions</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Hidden categories: <ul><li><a href="/wiki/Category:Extensions_without_an_image" title="Category:Extensions without an image">Extensions without an 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