PHP：多态抽象静态方法

Question

I'm trying to do something like this but i don't succeed.

abstract class Animal 
{ 
    abstract static function getName();
    static function sayName() { echo self::getName(); }
}

thanks!

Answer 1

You have two problems:

1. static functions can't be abstact in php anymore.
2. As said before, late static binding: as method getName() is defined in child class, you need to access it with static::getName() instead of self::getName()

Answer 2

如果您已经暗示了自己“不成功”的方式，那就太好了，但是我想您正在跨静态绑定绊脚石，需要使用PHP 5.3中引入的后期静态绑定 。

Answer 3

My guess is maybe you are trying to instantiate an object from that class.

You can't . It is an abstract class. Subclass it, and then instantiate that.

Answer 4

That will not succeed- you cannot have an abstract static function. See the accepted answer Why does PHP 5.2+ disallow abstract static class methods? for details on why.