PHP DOMDocument获取标签的属性 [英] PHP DOMDocument getting Attribute of Tag

问题描述

你好，我有一个api响应的xml格式与一系列的项目，如：

 < item> 
< title> blah balh< / title> 
< pubDate> Tue，20 Oct 2009< / pubDate> 
< media：file date =todaydata =example text string/> 
< / item> 
  

我想使用DOMDocument从标签media：file获取属性data。我下面的尝试不起作用：

  $ xmldoc = new DOMDocument（）; 
 $ xmldoc-> load（'api response address'）; 
 foreach（$ xmldoc-> getElementsByTagName（'item'）as $ feeditem）{
 $ nodes = $ feeditem-> getElementsByTagName（'media：file'）; 
 $ linkthumb = $ nodes-> item（0） - > getAttribute（'data'）; 
} 
  

我做错了什么？请帮助。

编辑：我不能因某种原因留下评论。我收到错误

 调用非对象的成员函数getAttribute（）
  

我也试过

  $ nodes = $ feeditem-> getElementsByTagNameNS（'uri'，'file'）; 
 $ linkthumb = $ nodes-> item（0） - > getAttribute（'data'）; 
  

其中uri是与媒体名称空间（NS）有关的uri，但是同样的问题。 / p>



请注意，媒体元素的形式不是我认为这是问题的一部分，因为我通常没有解析attibutes的问题。

解决方案

您提供的示例不应该生成错误。我测试了它，$ linkthumb包含字符串示例文本字符串如预期

确保媒体命名空间在返回的XML中定义，否则DOMDocument将出错。

如果您收到特定错误，请编辑您的帖子以包含

编辑：

尝试以下代码：

  $ xmldoc = new DOMDocument （）; 
 $ xmldoc-> load（'api response address'）; 
 foreach（$ xmldoc-> getElementsByTagName（'item'）as $ feeditem）{
 $ nodes = $ feeditem-> getElementsByTagName（'file'）; 
 $ linkthumb = $ nodes-> item（0） - > getAttribute（'data'）; 
 echo $ linkthumb; 
} 
  

您可能还想查看 SimpleXML 和 Xpath ，因为它使阅读XML比DOMDocument更容易。

Hello I have an api response in xml format with a series of items such as this:

<item>
<title>blah balh</title>
<pubDate>Tue, 20 Oct 2009 </pubDate>
<media:file  date="today" data="example text string"/>
</item>

I want to use DOMDocument to get the attribute "data" from the tag "media:file". My attempt below doesn't work:

$xmldoc = new DOMDocument();
$xmldoc->load('api response address');
foreach ($xmldoc->getElementsByTagName('item') as $feeditem) {
$nodes = $feeditem->getElementsByTagName('media:file');
$linkthumb = $nodes->item(0)->getAttribute('data');
}

What am I doing wrong? Please help.

EDIT: I can't leave comments for some reason Mark. I get the error

 Call to a member function getAttribute() on a non-object

when I run my code. I have also tried

$nodes = $feeditem->getElementsByTagNameNS('uri','file');
$linkthumb = $nodes->item(0)->getAttribute('data');

where uri is the uri relating to the media name space(NS) but again the same problem.

Note that the media element is of the form not I think this is part of the problem, as I generally have no issue parsing for attibutes.

解决方案

The example you provided should not generate an error. I tested it and $linkthumb contained the string "example text string" as expected

Ensure the media namespace is defined in the returned XML otherwise DOMDocument will error out.

If you are getting a specific error, please edit your post to include it

Edit:

Try the following code:

$xmldoc = new DOMDocument();
$xmldoc->load('api response address');
foreach ($xmldoc->getElementsByTagName('item') as $feeditem) {
    $nodes = $feeditem->getElementsByTagName('file');
    $linkthumb = $nodes->item(0)->getAttribute('data');
    echo $linkthumb;
}

You may also want to look at SimpleXML and Xpath as it makes reading XML much easier than DOMDocument.

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