二维数组按照某一键值进行排序

<?
$arr=array(array('id'=>'1','name'=>'lily','start'=>'20110101','end'=>'20110103'),
array('id'=>'2','name'=>'may','start'=>'20110101','end'=>'20110105'));


class array_sorter
{
   var $skey = false;
   var $sarray = false;
   var $sasc = true;

   function array_sorter(&$array, $key, $asc=true)
   {
       $this->sarray = $array;
       $this->skey = $key;
       $this->sasc = $asc;
   }

   function sortit($remap=true)
   {
       $array = &$this->sarray;
       uksort($array, array($this, "_as_cmp"));
       if ($remap)
       {
           $tmp = array();
           while (list($id, $data) = each($array))
               $tmp[] = $data;
           return $tmp;
       }
       return $array;
   }
   function _as_cmp($a, $b)
   {
       if (!is_array($a) && !is_array($b))
       {
           $a = $this->sarray[$a][$this->skey];
           $b = $this->sarray[$b][$this->skey];
       }

       //if string - use string comparision
       if (!ctype_digit($a) && !ctype_digit($b))
       {
           if ($this->sasc)
               return strcasecmp($a, $b);
           else 
               return strcasecmp($b, $a);
       }
       else
       {
           if (intval($a) == intval($b)) 
               return 0;

           if ($this->sasc)
               return (intval($a) > intval($b)) ? -1 : 1;
           else
               return (intval($a) > intval($b)) ? 1 : -1;
       }
   }

}

function multi_sort(&$array, $key, $asc=true)
{
       $sorter = new array_sorter($array, $key, $asc);
       return $sorter->sortit();
}
   //false和true控制升降序,end为数组键值
$my_array = multi_sort($arr, "end", false);
print_r($my_array);


?>