PHP 2차원 배열 정렬 사용자 정의 함수

<?php
/**
* func: array_sort
* desc: php二维数组排序
* edit: bbs.it-home.org
*/
function array_sort($arr,$keys,$type='asc'){
   $keysvalue = $new_array = array();
       foreach ($arr as $k=>$v){
       $keysvalue[$k] = $v[$keys];
   }
   if($type == 'asc'){
       asort($keysvalue);
   }else{
       arsort($keysvalue);
   }
   reset($keysvalue);
       foreach ($keysvalue as $k=>$v){
       $new_array[$k] = $arr[$k];
   }
   return $new_array;
} 
?>