引用子类的静态成员 [英] Referring to a static member of a subclass

问题描述

我希望有一个sub关键字，使下面的代码在执行时显示value.虽然没有，但我想知道-是否存在引用子类成员的现有方法?

I wish there was a sub keyword that would make the code below print value on execution. There isn't though and I wonder - is there an existing way to refer to a member of a subclass?

class Main
{
    static function foo()
    {
        echo sub::$variable;
    }
}

class Sub extends Main
{
    static $variable = "value";
}

Sub::foo();

推荐答案

我认为您正在寻找static::$variable.这称为后期静态绑定，并且自PHP起可用5.3.

I think you are looking for static::$variable. That's called Late Static Binding and is available as of PHP 5.3.

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