帮助使用DOMDocument解析XML [英] Help parsing XML with DOMDocument

问题描述

我正在尝试解析youtube播放列表字段.

I am trying to parse a youtube playlist field.

URL为: http://gdata.youtube.com/feeds/api/playlists/664AA68C6E6BA19B?v = 2

我需要:标题，视频ID和默认缩略图.

I need: Title, Video ID, and Default thumbnail.

我可以轻松获得标题，但是在嵌套元素方面我有点迷茫

I can easily get the title but I'm a little lost when it comes to the nested elements

        $data = new DOMDocument();
        if($data->load("http://gdata.youtube.com/feeds/api/playlists/664AA68C6E6BA19B?v=2"))
        {       
            foreach ($data->getElementsByTagName('entry') as $video)
            {
                $title = $video->getElementsByTagName('title')->item(0)->nodeValue;
                $id    = ??
                $thumb = ??                 
            }
        }

这里是XML(我删除了与该示例无关的元素)

Here is the XML (I have stripped out the elements that are irrelevant for this example)

<entry gd:etag="W/&quot;AkYGSXc9cSp7ImA9Wx9VGEk.&quot;">    
    <title>A GoPro Weekend On The Ice</title>

    <media:group>
        <media:thumbnail url="http://i.ytimg.com/vi/yk6wkfVNFQE/default.jpg" height="90" width="120" time="00:02:07" yt:name="default" />          
        <yt:videoid>yk6wkfVNFQE</yt:videoid>
    </media:group>

</entry>

我需要缩略图默认设置中的视频ID"和网址"

I need the "videoid" and the "url" from thumbnail-default

谢谢！

推荐答案

类似于 getElementsByTagName() 可以使用 getElementsByTagNameNS() 方法访问命名空间元素(可由namespace:element-name识别).

文档(如上链接)应该为您提供有关如何使用它的技术上的不足，足以说明它与以下类似(也请使用

The documenation (linked above) should give you the technical lowdown on how to use it, suffice to say it will be similar to the following (also using getAttribute()).

$yt    = 'http://gdata.youtube.com/schemas/2007';
$media = 'http://search.yahoo.com/mrss/';

// Inside your loop
$id    = $video->getElementsByTagNameNS($yt, 'videoid')->item(0)->nodeValue;
$thumb = $video->getElementsByTagNameNS($media, 'thumbnail')->item(0)->getAttribute('url');

希望这将为您跳进访问XML文档中命名空间项的跳板.

Hopefully that should give you a spring-board to leap into accessing namespaced items within your XML documents.

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