Module:If in category/doc

This is a documentation subpage for Module:If in category.
It may contain usage information, categories and other content that is not part of the original module page.

This Lua module is used on approximately 118,000 pages.
To avoid major disruption and server load, any changes should be tested in the module's /sandbox or /testcases subpages, or in your own module sandbox. The tested changes can be added to this page in a single edit. Consider discussing changes on the talk page before implementing them.

Due to a server limit of 500 "expensive parser function" calls (e.g. #ifexist:, PAGESIZE:, and PAGESINCATEGORY:), this module will only work properly if the page using it has not already exceeded the limit. When the limit is exceeded, the page using this template or module is categorised in Category:Pages with too many expensive parser function calls. (further information)

This module implements {{if in category}}

Usage

<syntaxhighlight lang="wikitext" inline>Lua error in Module:If_in_category at line 13: bad argument #1 to 'inArray' (table expected, got nil).</syntaxhighlight>

If |page= is omitted, the current page is used. If both the second and third unnamed parameters are omitted, the second unnamed parameter defaults to yes.