DOMNode到DOMElement在php [英] DOMNode to DOMElement in php

问题描述

我想将DOMNode对象从调用转换为getElementsByTagName到DOMElement，以便访问子元素上的getElementsByTagName等方法。以任何其他语言，我会投入，这将很容易，但经过一些快速查看，PHP没有对象投射。所以我需要知道的是如何从DOMNode对象获取一个DOMElement对象。

I want to convert a DOMNode object from a call to getElementsByTagName to a DOMElement in order to access methods like getElementsByTagName on the child element. In any other language, I would cast and it would be easy, but after some quick looking, PHP does not have object casting. So what I need to know is how to get a DOMElement object from a DOMNode object.

谢谢。

推荐答案

您不需要投掷任何东西，只需调用方法：

You don't need to cast anything, just call the method:

$links = $dom->getElementsByTagName('a');

foreach ($links as $link) {
    $spans = $link->getElementsByTagName('span');
}

顺便说一句，DOMElement是DOMNode的一个子类。如果你正在谈论一个DOMNodeList，那么可以通过使用DOMNodeList的item（）方法来获取这样一个列表中的元素，或者是上面提到的方法，使用foreach循环，或者通过使用DOMNodeList的item（）方法

And by the way, DOMElement is a subclass of DOMNode. If you were talking about a DOMNodeList, then accessing the elements in such a list can be done, be either the method presented above, with a foreach loop, either by using the item() method of DOMNodeList

$link_0 = $dom->getElementsByTagName('a')->item(0);

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