get_object_taxonomies() │ WP 2.3.0

Return the names or objects of the taxonomies which are registered for the requested object or object type, such as a post object or post type name.

Example:

$taxonomies = get_object_taxonomies( 'post' );

This results in:

Array( 'category', 'post_tag' )
Used By: get_the_taxonomies(), is_object_in_taxonomy()
1 time — -0.00003 sec (speed of light) | 50000 times — 0.20 sec (very fast) | PHP 7.4.25, WP 5.9.2

No Hooks.

Return

String[]|WP_Taxonomy[]. The names or objects of all taxonomies of $object_type.

Usage

get_object_taxonomies( $object, $output );
$object(string|string[]|WP_Post) (required)
Name of the type of taxonomy object, or an object (row from posts)
$output(string)
The type of output to return in the array. Accepts either 'names' or 'objects'.
Default: 'names'

Notes

  • Global. WP_Taxonomy[]. $wp_taxonomies The registered taxonomies.

Changelog

Since 2.3.0 Introduced.

Code of get_object_taxonomies() WP 6.0.1

wp-includes/taxonomy.php 
function get_object_taxonomies( $object, $output = 'names' ) {
	global $wp_taxonomies;

	if ( is_object( $object ) ) {
		if ( 'attachment' === $object->post_type ) {
			return get_attachment_taxonomies( $object, $output );
		}
		$object = $object->post_type;
	}

	$object = (array) $object;

	$taxonomies = array();
	foreach ( (array) $wp_taxonomies as $tax_name => $tax_obj ) {
		if ( array_intersect( $object, (array) $tax_obj->object_type ) ) {
			if ( 'names' === $output ) {
				$taxonomies[] = $tax_name;
			} else {
				$taxonomies[ $tax_name ] = $tax_obj;
			}
		}
	}

	return $taxonomies;
}

For posts