写一个二维数组排序算法函数，能够具有通用性

function array_sort($arr, $keys, $order=0) 
{
    if (!is_array($arr)) {
        return false;
    }
    $keysvalue = array();
    foreach($arr as $key => $val) {
        $keysvalue[$key] = $val[$keys];
    }
    if($order == 0){
        asort($keysvalue);
    }else {
        arsort($keysvalue);
    }
    reset($keysvalue);
    foreach($keysvalue as $key => $vals) {
        $keysort[$key] = $key;
    }
    $new_array = array();
    foreach($keysort as $key => $val) {
        $new_array[$key] = $arr[$val];
    }
    return $new_array;
}