PHP - 扩展方法就像扩展一个类 [英] PHP - extend method like extending a class

问题描述

我有2个类：

class animal{
    public function walk(){
        walk;
    }
}

class human extends animal{
    public function walk(){
        with2legs;
    }
}

这样，如果我调用human-> walk ），它只运行with2legs;

This way, if i call human->walk(), it only runs with2legs;

但我想运行父的步行;

But I want the run the parent's walk; too.

我知道我可以这样修改：

I know I can modify it this way:

class human extends animal{
    public function walk(){
        parent::walk();
        with2legs;
    }
}

但问题是，我有很多子类和不想把parent :: walk（）;进入每个孩子步行（）。有没有办法我可以扩展一个方法，如我扩展一个类？没有重写，但真正扩展的方法。还是有更好的替代品？

But the problem is, I have many subclasses and I don't want to put parent::walk(); into every child walk(). Is there a way I can extend a method like I extend a class? Without overriding but really extending the method. Or is there better alternatives?

谢谢。

推荐答案

使用hook和抽象概念：

class animal{

    // Function that has to be implemented in each child
    abstract public function walkMyWay();

    public function walk(){
        walk_base;
        walkMyWay();
    }
}

class human extends animal{
    // Just implement the specific part for human
    public function walkMyWay(){
        with2legs;
    }
}

class pig extends animal{
    // Just implement the specific part for pig
    public function walkMyWay(){
        with4legs;
    }
}

这种方式我只需要调用：

This way I just have to call :

// Calls parent::walk() which calls both 'parent::walk_base' and human::walkMyWay()
$a_human->walk();      
// Calls parent::walk() which calls both 'parent::walk_base' and pig::walkMyWay()
$a_pig->walk();

让孩子走路...

请参阅 模板方法模式 。

See Template method pattern.

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