php 二维数组打乱顺序

    public function shuffle_assoc($list) {
		if (!is_array($list)) return $list;   

		$keys = array_keys($list);
		shuffle($keys);
		$random = array();
		foreach ($keys as $key)
		$random[$key] = $this->shuffle_assoc($list[$key]);
		return $random;
     }
   public function test(){
    	$data = array(
		   array("id"=>13,"name"=>"张三"),
		   array("id"=>1,"name"=>"李爱媛"),
		   array("id"=>6,"name"=>"蔡依林"),
		   array("id"=>8,"name"=>"陈思"),
		   array("id"=>21,"name"=>"何达玲"),
		   array("id"=>14,"name"=>"赵勇"),
		);
		$tmp = $this->shuffle_assoc($data);
		var_dump($tmp);die;
   }
 //===============打印结果================

array(6) {
  [3]=>
  array(2) {
    ["id"]=>
    int(8)
    ["name"]=>
    string(6) "陈思"
  }
  [5]=>
  array(2) {
    ["id"]=>
    int(14)
    ["name"]=>
    string(6) "赵勇"
  }
  [1]=>
  array(2) {
    ["id"]=>
    int(1)
    ["name"]=>
    string(9) "李爱媛"
  }
  [0]=>
  array(2) {
    ["name"]=>
    string(6) "张三"
    ["id"]=>
    int(13)
  }
  [2]=>
  array(2) {
    ["id"]=>
    int(6)
    ["name"]=>
    string(9) "蔡依林"
  }
  [4]=>
  array(2) {
    ["id"]=>
    int(21)
    ["name"]=>
    string(9) "何达玲"
  }
}