wordpress函数cat_is_ancestor_of()用法示例

cat_is_ancestor_of( int|object $cat1,  int|object $cat2 )

Check if a category is an ancestor of another category.

描述

You can use either an id or the category object for both parameters. If you use an integer the category will be retrieved.

参数

$cat1

(int|object)
(Required)
ID or object to check if this is the parent category.

$cat2

(int|object)
(Required)
The child category.

返回值

(bool) Whether $cat2 is child of $cat1

源代码

File: wp-includes/category.php

function cat_is_ancestor_of( $cat1, $cat2 ) {
	return term_is_ancestor_of( $cat1, $cat2, 'category' );
}

更新日志

相关函数

Uses

• wp-includes/taxonomy.php:
  term_is_ancestor_of()

User Contributed Notes

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   Contributed by Codex

   Basic Example

   This example, placed in a theme’s archive.php, uses Conditional Tags to show different content depending on the category being displayed. This is helpful when it is necessary to include something for any child category of a given category, instead of using category-slug.php method where you’d have to create category-slug.php files for each and every category.

   The code snip below checks to see if the category called ‘Music’ (ID 4) is being processed, and if so, presents a wp_nav_menu for the Music archive page, and any subcategories of Music (e.g. jazz, classical.)

   
   <?php 
     // if the category is music or a music SUBcategory, 
     if (cat_is_ancestor_of(4, $cat) or is_category(4)):  ?>
     <div id="music_subnav_menu" class="subnav_menu">
       <?php wp_nav_menu( array('menu' => 'Music' )); ?>
     </div>
   <?php endif; ?>