register_taxonomy_for_object_type( string $taxonomy, string $object_type )

Adds an already registered taxonomy to an object type.

Parameters

$taxonomy

(Required) Name of taxonomy object.

$object_type

(Required) Name of the object type.

Return

(bool) True if successful, false if not.

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.