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

Checks if a category is an ancestor of another category.

Contents

Description
Parameters
Return
More Information
Source
Related
- Uses
Changelog
User Contributed Notes

Description

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

Parameters

$cat1 int|object Required: ID or object to check if this is the parent category.
$cat2 int|object Required: The child category.

Return

bool Whether $cat2 is child of $cat1.

More Information

The function evaluates if the second category is a child of the first category.
Any level of ancestry will return True.
Arguments should be either integer or objects; if arguments are string representations of integers and not true integers, cat_is_ancestor_of will return False.

Source

File: wp-includes/category.php. View all references

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

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Uses

Uses
Uses	Description
term_is_ancestor_of() wp-includes/taxonomy.php	Checks if a term is an ancestor of another term.

Changelog

Changelog
Version	Description
2.1.0	Introduced.

User Contributed Notes

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Contributed by Codex — 8 years ago
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; ?>
```
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