//这个是针对二维数组的!下面针对多维数组的乱序方法
<?php
function shuffle_assoc($list) {   
  if (!is_array($list)) return $list;   
  $keys = array_keys($list);   
  shuffle($keys);   
  $random = array();   
  foreach ($keys as $key)   
    $random[$key] = $list[$key];   
  return $random;   
}   
?>

//以下函数也是出自php手册，可以打乱多维数组
unction rec_assoc_shuffle($array)  
{  
  $ary_keys = array_keys($array);  
  $ary_values = array_values($array);  
  shuffle($ary_values);  
  foreach($ary_keys as $key => $value) {  
    if (is_array($ary_values[$key]) AND $ary_values[$key] != NULL) {  
      $ary_values[$key] = rec_assoc_shuffle($ary_values[$key]);  
    }  
    $new[$value] = $ary_values[$key];  
  }  
  return $new;  
}