使用SimpleXMLElement时添加名称空间 [英] adding a namespace when using SimpleXMLElement

问题描述

这就是我的追求

<!-- language: lang-xml -->
<ws:Test>
    <ws:somename2>somevalue2</ws:somename2>
    <ws:make>
        <ws:model>foo</ws:model>
        <ws:model>bar</ws:model>
    </ws:make>
</ws:Test>

这是我当前的代码

<!-- language: lang-php -->
$xmlTest = new SimpleXMLElement('<Test/>', 0, false, 'ws', true);
$xmlTest->addChild("ws:somename2", "somevalue2", 'http://microsoft.com/wsdl/types/');
$make = $xmlTest->addChild('ws:make', null, 'ws');
#$make->addAttribute('name','Ford');
$make->addChild('ws:model', 'foo', 'ws');
$make->addChild('ws:model', 'bar', 'ws');
header ("Content-Type:text/xml");
print_r($xmlTest->asXML());

但它输出

<!-- language: lang-xml -->
<Test>
    <ws:somename2>somevalue2</ws:somename2>
    <ws:make>
        <ws:model>foo</ws:model>
        <ws:model>bar</ws:model>
    </ws:make>
</Test>

您可以看到Test中缺少ws:

As you can see the ws: is missing from Test

推荐答案

SimpleXML有一个不寻常的怪癖，其中名称空间前缀是从根元素中过滤出来的.我不确定为什么会这样做.

SimpleXML has an unusual quirk where the namespace prefixes are filtered from the root element. I'm not sure why it does this.

但是，我使用的一种解决方法是基本上为前缀加上前缀，以便解析器仅删除第一个前缀，而保留第二个

However, a workaround I've used has been to basically prefix the prefix, so that the parser only removes the first ones, and leaves the second

$xmlTest = new SimpleXMLElement('<xmlns:ws:Test></xmlns:ws:Test>', LIBXML_NOERROR, false, 'ws', true);
$xmlTest->addAttribute('xmlns:xmlns:ws', 'http://url.to.namespace');
$xmlTest->addAttribute('xmlns:xmlns:xsi', 'http://www.w3.org/2001/XMLSchema-instance');

这似乎对我有用，尽管我有兴趣了解为什么SimpleXML完全做到这一点.

This seems to work for me, though I'm interested to understand why SimpleXML does this exactly.

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