php 二维数组排序算法函数

//二维数组排序， $arr是数据，$keys是排序的健值，$order是排序规则，1是升序，0是降序array_sort($arr, $keys, $order=0){if (!is_array($arr)){       return false;}$keys = array();foreach($arr as $key => $val){       $keys[$key] = $val[$keys];}if($order == 0){       asort($keys);}else{       arsort($keys);}reset($keys);foreach($keys as $key => $vals){       $keysort[$key] = $key;}$new_array = array();foreach($keysort as $key => $val){       $new_array[$key] = $arr[$val];}return $new_array;}