从类继承Interface调用静态方法

Question

可能重复:
引用子类的静态成员

请查看以下代码以了解我的问题.

<?php

Interface IDoesSomething
{
    public static function returnSomething();
}

abstract class MiddleManClass implements IDoesSomething
{
    public static function doSomething()
    {
        return 1337 * self::returnSomething();
    }
}

class SomeClass extends MiddleManClass
{
    public static function returnSomething()
    {
        return 999;
    }
}

// and now, the vicious call
$foo = SomeClass::doSomething();

/**
 * results in a
 * PHP Fatal error:  Cannot call abstract method IDoesSomething::returnSomething()
 */
?>

有没有办法强制抽象,returnSomething()同时保持从抽象"中间人"类中定义的函数调用函数的可能性？看起来像是我的PHP瓶颈.

Answer 1

如果您的php版本> = 5.3然后更改

public static function doSomething()
{
    return 1337 * self::returnSomething();
}

至

public static function doSomething()
{
    return 1337 * static::returnSomething();
}