PHP致命错误：无法继承抽象函数

我不明白我在做错什么

abstract class Css {
    abstract protected function parse($data);
}

abstract class CssElem extends Css {
    abstract protected function parse($data);
}

class Modifier extends CssElem {
    function __construct($data = null) {
        if( $data )
            $this->parse ($data);
    }

    protected function parse($data) {
       // Some code...
    }
}

它给了我

[Mon Jul 8 13:21:10 2013] PHP Fatal error: Can’t inherit abstract
function Css::parse() (previously declared abstract in CssElem) in
/home/arthur/NetBeansProjects/capa/CssElem.php on line 21 [Mon Jul 8
13:21:10 2013] 127.0.0.1:41207 [500]: / – Can’t inherit abstract
function Css::parse() (previously declared abstract in CssElem) in
/home/arthur/NetBeansProjects/capa/CssElem.php on line 21

第21行是抽象保护函数解析($data);在CssElem.

我更熟悉Java中的OOP,但根据the doc …

abstract class CssElem extends Css {
    // abstract protected function parse($data); // <-- take this away
}

参见文档中的this comment.

引用来自评论：

An abstract class that extends an abstract class can pass the buck to its child classes when it comes to implementing the abstract methods of its parent abstract class.

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