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register_taxonomy_for_object_type()

register_taxonomy_for_object_type( string $taxonomy, string $object_type ): bool

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Adds an already registered taxonomy to an object type.

Parameters

$taxonomystringrequired
Name of taxonomy object.
$object_typestringrequired
Name of the object type.

Return

bool True if successful, false if not.

Source

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, true ) ) {
		$wp_taxonomies[ $taxonomy ]->object_type[] = $object_type;
	}

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

	/**
	 * Fires after a taxonomy is registered for an object type.
	 *
	 * @since 5.1.0
	 *
	 * @param string $taxonomy    Taxonomy name.
	 * @param string $object_type Name of the object type.
	 */
	do_action( 'registered_taxonomy_for_object_type', $taxonomy, $object_type );

	return true;
}

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Hooks

do_action( ‘registered_taxonomy_for_object_type’, string $taxonomy, string $object_type )

Fires after a taxonomy is registered for an object type.

UsesDescription
do_action()wp-includes/plugin.php

Calls the callback functions that have been added to an action hook.

get_post_type_object()wp-includes/post.php

Retrieves a post type object by name.

Used byDescription
WP_Post_Type::register_taxonomies()wp-includes/class-wp-post-type.php

Registers the taxonomies for the post type.

Changelog

VersionDescription
3.0.0Introduced.

User Contributed Notes

  1. Skip to note 3 content
    davidguerreiro
    You must log in to vote on the helpfulness of this noteVote results for this note: 2You must log in to vote on the helpfulness of this note

    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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