将字符串$pizza = "a,b,c,d";变为$pizza = "d,c,b,a";
$pizza = "a,b,c,d";
$pieces = explode(",", $pizza);
$arr = array($pieces [3],$pieces [2],$pieces [1],$pieces [0]);
字符串转数组
$data ='ABCDJLSJDFLJ_IkkIkTw6_gQ2zvbyj_TEqRUUtL_JfmaaQjz';
$newdata = explode("_",$data);
