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Description

This Conditional Tag Check if a term is an ancestor of another term. This is a boolean function, meaning it returns either TRUE or FALSE.

Usage

 <?php term_is_ancestor_of( $term1, $term2, $taxonomy ); ?> 

Parameters

$term1

(int/object) (required) ID or object to check if this is the parent term.

Default: None

$term2

(int/object) (required) The child term.

Default: None

$taxonomy

(string) (required) Taxonomy name that $term1 and $term2 belong to.

Default: None

Return Values

(boolean) 

True if term1 is a term of term2, False if not.

Examples

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

The code snip below checks to see if the term called 'Music' (ID 4) for the taxonmy 'Sound' is being processed, and if so, presents a wp_nav_menu for the Music archive page, and any subterms of Music (e.g. jazz, classical.)

<?php 
  // if the taxonomy is sound and the term is music 
  if (term_is_ancestor_of(4, $term, 'sound') or is_term(4, 'sound')):  ?>
  <div id="music_subnav_menu" class="subnav_menu">
    <?php wp_nav_menu( array('menu' => 'Music' )); ?>
  </div>
<? endif; ?>

Notes

• The function evaluates if the second term is a child of the first term.
• 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 term_is_ancestor_of will return False.

Change Log

Since: 3.4.0

Source File

term_is_ancestor_of() is located in wp-includes/taxonomy.php.

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Taxonomy:Conditional Tags Taxonomy:Functions