Variables Category:Stable extensions/zh
	Category:Parser function extensions/zh
描述	介绍页面作用的变量函数。
作者	Rob Adams, Tom Hempel, Xiloynaha, Daniel Werner, MGChecker
	MGChecker
最新版本	2.5.1 (2019-07-11)
MediaWiki	1.29+Category:Extensions with manual MediaWiki version
PHP	5.5+
	否
	ISC授權條款
下載	下載 Git [?]: 浏览存储库 (Phabricator · GitHub) Gerrit代码 Git提交日誌 下載原始碼(tarball壓縮) Category:Extensions in Wikimedia version control/zh README RELEASE-NOTES
$wgVariablesAreVolatile $wgVariablesDisabledFunctions
ParserClearState Category:ParserClearState extensions/zh ParserFirstCallInit Category:ParserFirstCallInit extensions/zh
季度下載量	102 (Ranked 42nd)
正在使用的公开wiki数	1,808 (Ranked 201st)
前往translatewiki.net翻譯Variables
Vagrant角色	variables
問題	开启的任务 ·

警告：

This extension is incompatible with plans to parallelize parsing, as is intended by the use of Parsoid . 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 T250963 and No support for sequential, in-order processing of extension tags .

变量（Variables）扩展允许您在页面中定义变量，然后在同一页面或包含的模板中使用、改变它的值，可以是按照表达式根据旧值计算得来等。

它很像模板，只是占用内存非常少并且作用只能在1个页面，所以你可以在1个页面使用很多个变量，不会出现因使用大量的模板导致维基运行缓慢的问题。结合解析器函數 扩展以达到最好的结果。

给变量赋值

检索变量的值

解析器函數 扩展必须已安装以使用#expr。

计算x = 2*a + b：

• {{#vardefine:x|{{#expr:2*{{#var:a}}+{{#var:b}}}}}}

令变量n加1：

• {{#vardefine:n|{{#expr:{{#var:n}}+1}}}}

安裝

• 下载，并将解压后的Variables移动到extensions/目录中。
  开发者和代码贡献人员应从Git安装扩展，输入：cd extensions/
git clone https://gerrit.wikimedia.org/r/mediawiki/extensions/Variables
• 将下列放置在您的LocalSettings.php 的底部：

  wfLoadExtension( 'Variables' );
  

• Configure as required
• 完成 – 在您的wiki上至Special:Version，以验证已成功安装。

該擴充功能提供了兩個配置參數：

$egVariablesAreVolatile

Allows to disable the parser frame being marked as volatile by the extension, i.e. disable template caching.

true;

$egVariablesDisabledFunctions

允許指定停用此擴充功能提供的解析器功能。

[];

示例： [ 'var_final', 'vardefineecho' ];

兼容性

下面列出了最近MediaWiki版本的Variables扩展的推荐版本。较旧版本的扩展可能也可以正常工作，但未针对新的MediaWiki版本进行测试。

替代選項

由于这个扩展不被维基媒体基金会（WMF）启用，以下是一些替代选择：^[1][2][3][4]

• 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 expansion depth limit, which can be increased if necessary.
• If you use Variables to do more complex template operations than possible with simple :解析器函數 , and if you have sufficient permissions on the server, you can use Scribunto'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, Extension:VariablesLua adds a Scribunto interface for the Variables store.
• 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.
• If you require variables just for autonumbering, you could look into Extension:NumerAlpha .

参见

• 扩展:Php标签
• Extension:MyVariables – 在MediaWiki创建新变量
• :迴圈 – 提供执行循环的解析器函数
• : – Create an array and provide array functions（比如搜索、分离、排序）and set operations (such as intersect, union and diff)
• Extension:HashTables – 用于处理MediaWiki的hash table的新解析器函数

参考资料

此在以下wiki农场/托管网站和/或软件包中提供： BlueSpice Category:Extensions included in BlueSpice/zh Canasta Category:Extensions included in Canasta/zh Fandom Category:Extensions included in Fandom/zh Miraheze Category:Extensions included in Miraheze/zh Open CSPCategory:Extensions included in Open CSP/zh ProWikiCategory:Extensions included in ProWiki/zh semantic::coreCategory:Extensions included in semantic::core/zh TelepediaCategory:Extensions included in Telepedia/zh wiki.gg Category:Extensions included in wiki.gg/zh WikiForgeCategory:Extensions included in WikiForge/zh 這不是一份權威名單。 即使某些wiki农场/托管网站和/或软件包未在这里列出，它们也可能提供此。 请检查你的wiki农场/托管网站或软件包以确认提供情况。