php魔术方法 __isset()

Posted 2022-06-05 xm666

<?php
//app
class Stu

    private $n = ‘小红‘;
    public function __isset($n)
    
        return isset($this->$n);
    

$obj = new Stu();
if(isset($obj->n))

    echo ‘有值‘;
else
    echo ‘无值‘;