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    /*
    * ¶þάÊý×e×Ô¶¨ÒaÅÅÐoº¯Êý
    * uasort($arr,function_name)
    *
    **/
    $arr = array(
      array('a'=>1,'b'=>'c'),
      array('a'=>4,'b'=>'a'),
      array('a'=>5,'b'=>'g'),
      array('a'=>7,'b'=>'f'),
      array('a'=>6,'b'=>'e')
    );
    function compare_arr($x,$y){
      if($x['b']<$y['b']){
        return -1;
      }else if($x['b']>$y['b']){
        return 1;
      }else{
        return 0;
      }
    }
    uasort($arr,'compare_arr');
    foreach($arr as $a){
      echo $a['a'].'=>'.$a['b'].'<br/>';
    }

ÊÖ²aÀiµÄ×Ô¶¨ÒaÅÅÐoÀa£º

    class multiSort
    {
       var $key;  //key in your array
       //ÅÅÐoº¯Êý ²ÎÊýÒÀ´ÎÊÇ Êý×e ´ýÅÅÁÐË÷Òý ÅÅÐoÀaÐÍ
       function run ($myarray, $key_to_sort, $type_of_sort = '')
       {
         $this->key = $key_to_sort;
         if ($type_of_sort == 'desc')
           uasort($myarray, array($this, 'myreverse_compare'));
         else
           uasort($myarray, array($this, 'mycompare'));
         return $myarray;
       }
       //ÕýÐo
       function mycompare($x, $y)
       {
         if ( $x[$this->key] == $y[$this->key] )
           return 0;
         else if ( $x[$this->key] < $y[$this->key] )
           return -1;
         else
           return 1;
       }
       //ÄaeÐo
       function myreverse_compare($x, $y)
       {
         if ( $x[$this->key] == $y[$this->key] )
           return 0;
         else if ( $x[$this->key] > $y[$this->key] )
           return -1;
         else
           return 1;
       }
    }

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