php冒泡排序

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<?php     $arr = array(1,4,2,9,0,10,12,3,7);     foreach($arr as $val)     {        echo $val."--";     }     echo "<br/>";     function bubble_sort(&$arr)     {         $len = count($arr);         for($i = 1; $i <= $len - 1; $i++)         {             for($j = $i; $j >=0; $j--)             {                  if($arr[$j] < $arr[$j-1])                  {                       $temp      = $arr[$j];                       $arr[$j]   = $arr[$j-1];                       $arr[$j-1] = $temp;                  }             }         }       }            bubble_sort($arr);     foreach($arr as $val)     {        echo $val."--";     }     ?>