walk_category_tree

 * @since 3.1.0
 * @access private
 *
 * @param object $a The first object to compare.
 * @param object $b The second object to compare.
 * @return bool Whether the count value for `$a` is greater than the count value for `$b`.
 */
function _wp_object_count_sort_cb( $a, $b ) {
	return ( $a->count > $b->count );
}