使用PHP DOMDocument从带有冒号的命名空间的xml节点获取值

问题描述：

I'm parsing xml document using DOMDocument class. First I've selected all nodes with name 'item' using $xml->getElementsByTagName('item') method. My sample xml file looks like this:

<item>
      <title>...</link>
      <description>...</description>
      <pubDate>...</pubDate>
      <ns:author>...</dc:creator>
</item>

However my problem is getting value from nested tag with namespace name with colon sign. I get values from nodes without namespaces in foreach using $node->getElementsByTagName('description')->item(0)->nodeValue and there is no errors.

I also found method getElementsByTagNameNs() to get nodes with it's namespaces. However when i try to get nodeValue like previous nodes without namespace I get "PHP Notice: Trying to get property of non-object". I think it is strange because getElementsByTagNameNs()->item(0) returns object DOMElement.

Do you know how to take value from node with namespace, in this case <ns:author></dc:creator> element?

我正在使用DOMDocument类解析xml文档。首先，我使用$ xml-＆gt; getElementsByTagName（'item'） code>方法选择名为'item'的所有节点。我的示例xml文件如下所示： p>

 ＆lt; item＆gt; 
＆lt; title＆gt; ...＆lt; / link＆gt; 
＆lt; description＆gt; ...＆lt;  ; / description＆gt; 
＆lt; pubDate＆gt; ...＆lt; / pubDate＆gt; 
＆lt; ns：author＆gt; ...＆lt; / dc：creator＆gt; 
＆lt; / item＆gt; 
  code>   pre> 
 
 但是我的问题是从带有冒号的命名空间名称的嵌套标记中获取值。 我使用 $ node-＆gt; getElementsByTagName（'description'） - ＆gt; item（0） - ＆gt; nodeValue  code>从 foreach  code>中获取没有名称空间的节点的值，并且没有 错误。 p> 
 
 
我还发现方法getElementsByTagNameNs（）来获取带有命名空间的节点。 然而，当我尝试像没有命名空间的先前节点那样获得nodeValue时，我得到“PHP注意：尝试获取非对象的属性”。 我认为这很奇怪，因为 getElementsByTagNameNs（） - ＆gt; item（0） code>返回对象DOMElement。 p> 
 
 
您是否知道如何从带有命名空间的节点获取值， 在这种情况下＆lt; ns：author＆gt;＆lt; / dc：creator＆gt;  code>元素？ p> 
  div>

答

As the document fragment you give isn't complete and even valid, I've had to make a few changes. You say you want the value of <ns:author>...</dc:creator> which is not a valid element as the open and close names are different in both name and namespace, you would expect something like <ns:author>...</ns:author>

As an example of how you can fetch the values from a namespace (using some corrected and some guessed alterations to the XML)...

$xml = <<<XML
<?xml version="1.0"?>
<items xmlns:ns="http://some.url">
    <item>
      <title>title</title>
      <description>Descr.</description>
      <pubDate>1/1/1970</pubDate>
      <ns:author>author1</ns:author>
    </item>
</items>
XML;

$dom = new DOMDocument( '1.0', 'utf-8' );
$dom->loadXML($xml);
$items = $dom->getElementsByTagName('item');
foreach ( $items as $item )  {
    $author = $item->getElementsByTagNameNS("http://some.url", "*")->item(0)->nodeValue;
    echo "Author = ".$author.PHP_EOL;
}

In getElementsByTagNameNS() you will need to put in the correct URL for this namespace, which should be in the source document.

This outputs...

Author = author1

使用PHP DOMDocument从带有冒号的命名空间的xml节点获取值

相关推荐