register_taxonomy_for_object_type( string $taxonomy, string $object_type )

Add an already registered taxonomy to an object type.

Description Description

Parameters Parameters


(string) (Required) Name of taxonomy object.


(string) (Required) Name of the object type.

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Return Return

(bool) True if successful, false if not.

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Source Source

File: wp-includes/taxonomy.php

function register_taxonomy_for_object_type( $taxonomy, $object_type) {
	global $wp_taxonomies;

	if ( !isset($wp_taxonomies[$taxonomy]) )
		return false;

	if ( ! get_post_type_object($object_type) )
		return false;

	if ( ! in_array( $object_type, $wp_taxonomies[$taxonomy]->object_type ) )
		$wp_taxonomies[$taxonomy]->object_type[] = $object_type;

	// Filter out empties.
	$wp_taxonomies[ $taxonomy ]->object_type = array_filter( $wp_taxonomies[ $taxonomy ]->object_type );

	return true;

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Changelog Changelog

Version Description
3.0.0 Introduced.

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User Contributed Notes User Contributed Notes

  1. Skip to note 2 content
    Contributed by davidguerreiro

    Do not forget to use the init hook to run this function. If not, the taxonomy and / or the CPT you want to reference might not have been created yet.

     * Share taxonomy pdf-groups with posts
     * @return void
    function namespace_share_category_with_pages() {
    	register_taxonomy_for_object_type( 'category', 'page' );
    add_action( 'init', 'namespace_share_category_with_pages' );

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