php魔术方法__set()

<?php
//app
class Stu
{
    private $n = '小红';
    private $v = '成龙';
    public function __set($v,$n)
    {
        echo $this-> $v = $n;
        // echo '你访问的是私有属性';
    }
}
$obj = new Stu();
$obj->n = '杰伦';
$obj->v = '蔡依林';

set魔术方法直接改值