Function Reference/is category

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This Conditional Tag checks if a Category archive page is being displayed. This is a boolean function, meaning it returns either TRUE or FALSE.

To test if a post is in a category use in_category().


%%%<?php is_category( $category ); ?>%%%


(mixed) (optional) Category ID, Category Title, Category Slug or Array of IDs, names, and slugs.
Default: Nonenoinclude

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This template is for standardizing how parameters look in the Function Reference and in Template Tags. Here is an example of this template being called: prenowiki检查到模板循环:模板:Parameter/nowiki/pre 检查到模板循环:模板:Parameter

The usage of this template is below: prenowiki检查到模板循环:模板:Parameter/nowiki/pre Let's take a closer look at the parameters..

The name of the parameter.
The datatype that should be given for this parameter when called.
  • string
  • integer
  • boolean
  • mixed
A short description of the parameter.
Set this parameter to optional if the parameter is optional. Otherwise, do not declare this parameter—it defaults to required.
  • required
  • optional
If this parameter is optional, ttdefault/tt is the value that will be used if the parameter is not declared. /div /noinclude

Return Values

True on success, false on failure.


// When any Category archive page is being displayed.

is_category( '9' );
// When the archive page for Category 9 is being displayed.

is_category( 'Stinky Cheeses' );
// When the archive page for the Category with Name "Stinky Cheeses" is being displayed.

is_category( 'blue-cheese' );
// When the archive page for the Category with Category Slug "blue-cheese" is being displayed.

is_category( array( 9, 'blue-cheese', 'Stinky Cheeses' ) );
// Returns true when the category of posts being displayed is either term_ID 9, or slug "blue-cheese", or name "Stinky Cheeses". Note: the array ability was added at Version 2.5.


Change Log

Since: 1.5.0

Source File

is_category() is located in onlyincludecodewp-includes/query.php/code/onlyinclude

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Template Description

Link to the source code on


  1. filename
  2. (option) path to codetag/code (version) or codetrunk/code. This option is only used for a new /Default: codetrunk/code -- trunk is the latest bleeding edge development version of WordPress.


Link to the stable version: pre检查到模板循环:模板:Trac/pre

Link to trunk: pre检查到模板循环:模板:Trac/pre



Conditional Tags: comments_open(), is_local_attachment(), is plugin active(), is_404(), is_admin(), is_archive(), is_attachment(), is_author(), is_category(), is_comments_popup(), is_date(), is_day(), is_feed(), is_front_page(), is_home(), is_month(), is_new_day(), is_page(), is_page_template(), is_paged(), is_plugin_page(), is_preview(), is_search(), is_single(), is_singular(), is_sticky(), is_tag(), is_tax(), is_taxonomy_hierarchical(), is_time(), is_trackback(), is_year(), in_category(), in_the_loop(), is_active_sidebar(), is_active_widget(), is_blog_installed(), is_dynamic_sidebar(), is_user_logged_in(), has_excerpt(), has_post_image(), has_tag(), pings_open(), post_type_exists(), taxonomy_exists(), term_exists(), username exists()

includeonlydiv style=clear:both; background-color:#F7F7F7; border:1px solid #CCCCCC; color:#000000; padding:7px; margin:0.5em auto 0.5em auto; vertical-align:middle;See also index of Function Reference and index of Template Tags./div/includeonlynoinclude


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