如何在php中调用受保护的方法? [英] How to call a protected method in php?

问题描述

这是类结构.我也希望Observer:callme()也可以从Children那里调用.

here is the class structure. I want Observer:callme() to be callable from Children too.

class Observer
{
    protected callme()
    {
    }
}

class Parent extends Observer
{
    function createChild()
    {
        $this->callme(); // this is OK
        return new Child ($this);
    }
}

class Child
{
    private $this myParent;
    public function __constructor ($myParent)
    {
        $this->myParent = $myParent;
    }

    public function __destroy()
    {
        $this->myParent->callme(); // FAIL!
    }
}

那么如何使FAIL工作呢? (无需将其公开，因为它仅用于父母"及其孩子"内部)

so how to make FAIL work? (without making it public, because its only for used inside "Parent" and its "Children")

推荐答案

问题是只能从相同的类或子类中访问受保护的方法.您可以做的是从Parent扩展Child类，就像这样:

The problem is that a protected method is only accessed from the same class or the class children. What you can do is extend your Child class from Parent, like this:

class Child extends Parent
{
    public function __constructor ()
    {
        parent::__constructor();
    }

    public function __destroy()
    {
        $this->callme(); // Should work!
    }
}

或者只是将方法更改为public.

Or just change the method to public.

顺便说一句，这段代码是您将要使用的某种真实代码吗?那个接收父对象的构造函数似乎是错误的.您想完成什么?

And, btw, is this code some kind of real code that you will use? That constructor receiving the parent object seems to be so wrong. What are you trying to accomplish?

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