嗨，我是php的新手。我有一个数组$arr=array(0=>array('GID'=>1,'groupname'=>"cat1",'members'=>array(0=>array('mid'=>11,'mname'=>'wwww'),1=>array('mid'=>12,'mname'=>'wswww'))),1=>array('GID'=>2,'groupname'=>"cat2",'members'=>array(0=>array('mid'=>13,'mname'=>'gggwwww'),1=>array('mid'=>14,'mname'=>'wvvwww'))),2=>a