PHP受保护的类和私有类什么区别

受保护的继承后可以访问，私有的只能在该类中访问，不会被继承访问
class Man{
    protected $name='lee';//受保护
    private    $age=123;//私有
    function __construct(){
        echo $this->name;//lee
        echo $this->age;//123

    }

}
class Girl extends Man{
    function __construct(){
        echo $this->name;//lee
        echo $this->age;//不会出现123,

    }

}

new Man();

new Girl();

<?php
class Man{
    protected $name='lee';//受保护
    private    $age=123;//私有
    function __construct(){
        echo $this->name;//lee
        echo $this->age;//123

    }

}
class Girl extends Man{
    function __construct(){
        echo $this->name;//lee
        echo $this->age;//不会出现123,

    }

}

new Man();

new Girl();