Question

get_term_children( string $term_id,  string $taxonomy )

Merge all term children into a single array of their IDs.

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description

This recursive function will merge all of the children of $term into the same array of term IDs. Only useful for taxonomies which are hierarchical.

Will return an empty array if $term does not exist in $taxonomy.

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参数

$term_id

(string) (Required) ID of Term to get children.

$taxonomy

(string) (Required) Taxonomy Name.

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返回值

(array|WP_Error) List of Term IDs. WP_Error returned if $taxonomy does not exist.

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源代码

File: wp-includes/taxonomy.php

function get_term_children( $term_id, $taxonomy ) {
	if ( ! taxonomy_exists( $taxonomy ) ) {
		return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
	}

	$term_id = intval( $term_id );

	$terms = _get_term_hierarchy($taxonomy);

	if ( ! isset($terms[$term_id]) )
		return array();

	$children = $terms[$term_id];

	foreach ( (array) $terms[$term_id] as $child ) {
		if ( $term_id == $child ) {
			continue;
		}

		if ( isset($terms[$child]) )
			$children = array_merge($children, get_term_children($child, $taxonomy));
	}

	return $children;
}

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更新日志

Version	description
2.3.0	Introduced.

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相关函数

Uses

• wp-includes/l10n.php: __()
• wp-includes/taxonomy.php: get_term_children()
• wp-includes/taxonomy.php: taxonomy_exists()
• wp-includes/class-wp-error.php: WP_Error::__construct()

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Used By

• wp-includes/class-wp-term-query.php: WP_Term_Query::get_terms()
• wp-includes/class-wp-tax-query.php: WP_Tax_Query::clean_query()
• wp-includes/taxonomy.php: get_term_children()

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User Contributed Notes

1. Skip to note content You must log in to vote on the helpfulness of this noteVote results for this note: 0You must log in to vote on the helpfulness of this note Contributed by Codex

   A Basic Example
   Used to get an array of children taxonomies and write them out with links in an unordered list.

   
   <?php
   $term_id = 10;
   $taxonomy_name = 'products';
   $termchildren = get_term_children( $term_id, $taxonomy_name );
   
   echo '<ul>';
   foreach ( $termchildren as $child ) {
   	$term = get_term_by( 'id', $child, $taxonomy_name );
   	echo '<li><a href="' . get_term_link( $child, $taxonomy_name ) . '">' . $term->name . '</a></li>';
   }
   echo '</ul>';
   ?> 
   

   This would return something like.

   
   <ul> 
   <li><a href="link_to_term_page">Term 1</a></li>
   <li><a href="link_to_term_page">Term 2</a></li>
   </ul>