用多个命名空间解析XML [英] Parsing XML with multiple namespaces

问题描述

所以我想解析这个XML：

So I wanted to parse this XML:

<?xml version="1.0" encoding="utf-8"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <soapenv:Body>
    <requestContactResponse xmlns="http://webservice.foo.com">
      <requestContactReturn>
        <errorCode xsi:nil="true"/>
        <errorDesc xsi:nil="true"/>
        <id>744</id>
      </requestContactReturn>
    </requestContactResponse>
  </soapenv:Body>
</soapenv:Envelope>

具体来说，我想获取标签的价值< id>

Specifically I want to get the value of the tag <id>

这是我试过的：

$dom = new DOMDocument;
$dom->loadXML($xml);
$dom->children('soapenv', true)->Envelope->children('soapenv', true)->Body->children()->requestContactResponse->requestContactReturn->id;

但是我收到此错误消息：

But I get this error message:

PHP致命错误：调用未定义的方法DOMDocument :: children（）

PHP Fatal error: Call to undefined method DOMDocument::children()

我也试过使用simpleXML：

I've also tried to use simpleXML:

$sxe = new SimpleXMLElement($xml);
$sxe->children('soapenv', true)->Envelope->children('soapenv', true)->Body->children()->requestContactResponse->requestContactReturn->id;

但是我收到这个其他错误信息：

But I get this other error message:

PHP致命错误：调用非对象的成员函数children（）

PHP Fatal error: Call to a member function children() on a non-object

最后解决方案我试过：

$sxe = new SimpleXMLElement($xml);
$elements = $sxe->children("soapenv", true)->Body->requestContactResponse->requestContactReturn;

foreach($elements as $element) {
    echo "|-$element->id-|";
}

这次错误消息是：

Invalid argument supplied for foreach() 

任何建议？

推荐答案

在这里播放的文件不足之处在于，当您使用 - > children ，它对于后代节点仍然有效。

The poorly documented fact in play here is that when you select a namespace with ->children, it remains in effect for descendent nodes.

所以当你要求 $ sxe-> children（soapenv，true） - > Body-> requestContactResponse ，SimpleXML假定您仍在谈论soapenv / code>命名空间，所以寻找元素< soapenv：requestContactResponse> ，不存在。

So when you ask for $sxe->children("soapenv", true)->Body->requestContactResponse, SimpleXML assumes you are still talking about the "soapenv" namespace, so is looking for the element <soapenv:requestContactResponse>, which doesn't exist.

要切换回默认命名空间，您需要再次调用 - > children ， NULL namespace：

To switch back to the default namespace, you need to call ->children again, with a NULL namespace:

$sx->children("soapenv", true)->Body->children(NULL)->requestContactResponse->requestContactReturn->id

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