如何从扩展PHP类中的静态调用中获取类名？ [英] How can I get the classname from a static call in an extended PHP class?

问题描述

我有两个类： Action 和 MyAction 。后者被声明为：

I have two classes: Action and MyAction. The latter is declared as:

class MyAction extends Action {/* some methods here */}

我需要的只是 Action 类中的方法（仅在其中，因为将有很多继承的类，我不想在所有这些中实现这个方法），它将从静态调用返回classname。以下是我所说的：

All I need is method in the Action class (only in it, because there will be a lot of inherited classes, and I don’t want to implement this method in all of them), which will return classname from a static call. Here is what I’m talking about:

Class Action {
 function n(){/* something */}
}

当我给它打电话时：

MyAction::n(); // it should return "MyAction"

但是父类中的每个声明只能访问父类class __ CLASS __ 变量，其值为Action。

But each declaration in the parent class has access only to the parent class __CLASS__ variable, which has the value "Action".

有没有可行的方法呢？

推荐答案

__ CLASS __ 始终返回使用它的类的名称，所以它对静态方法没有多大帮助。如果方法不是静态的，您只需使用 get_class （$ this）。例如。

__CLASS__ always returns the name of the class in which it was used, so it's not much help with a static method. If the method wasn't static you could simply use get_class($this). e.g.

class Action {
    public function n(){
        echo get_class($this);
    }

}

class MyAction extends Action {

}

$foo=new MyAction;

$foo->n(); //displays 'MyAction'

后期静态绑定，PHP 5.3 +

现在发布了PHP 5.3，你可以使用后期静态绑定，它允许您在运行时而不是在定义时解析静态方法调用的目标类。

Late static bindings, available in PHP 5.3+

Now that PHP 5.3 is released, you can use late static bindings, which let you resolve the target class for a static method call at runtime rather than when it is defined.

虽然该功能未引入新的魔术常量告诉你通过它调用的类名，它确实提供了一个新功能， get_called_class（）可以告诉你调用静态方法的类的名称。这是一个例子：

While the feature does not introduce a new magic constant to tell you the classname you were called through, it does provide a new function, get_called_class() which can tell you the name of the class a static method was called in. Here's an example:

Class Action {
    public static function n() {
        return get_called_class();
    }
}


class MyAction extends Action {

}


echo MyAction::n(); //displays MyAction

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