unregister_post_type( string $post_type ): true|WP_Error

1925function unregister_post_type( $post_type ) {1926	global $wp_post_types;1927 1928	if ( ! post_type_exists( $post_type ) ) {1929		return new WP_Error( 'invalid_post_type', __( 'Invalid post type.' ) );1930	}1931 1932	$post_type_object = get_post_type_object( $post_type );1933 1934	// Do not allow unregistering internal post types.1935	if ( $post_type_object->_builtin ) {1936		return new WP_Error( 'invalid_post_type', __( 'Unregistering a built-in post type is not allowed' ) );1937	}1938 1939	$post_type_object->remove_supports();1940	$post_type_object->remove_rewrite_rules();1941	$post_type_object->unregister_meta_boxes();1942	$post_type_object->remove_hooks();1943	$post_type_object->unregister_taxonomies();1944 1945	unset( $wp_post_types[ $post_type ] );1946 1947	/**1948	 * Fires after a post type was unregistered.1949	 *1950	 * @since 4.5.01951	 *1952	 * @param string $post_type Post type key.1953	 */1954	do_action( 'unregistered_post_type', $post_type );1955 1956	return true;1957}