枚举PHP DOMDocument对象的注册名称空间 [英] Enumerate registered namespaces of a PHP DOMDocument object

问题描述

对于我的一个项目，我正在使用 DOMDocument 类加载和操作XML文档。

For one of my projects, I'm using the DOMDocument class to load and manipulate XML documents.

我需要检索文档中使用的每个名称空间；但是，我找不到我该怎么做。 DOMDocument 类具有获取URI的名称空间前缀或名称空间前缀的URI的方法，但是我没有看到任何枚举注册的名称空间的方法。

I'd need to retrieve every namespace used in the document; however, I can't find how I'd do that. The DOMDocument class has methods to get the namespace prefix of an URI or the URI of a namespace prefix, but I've seen nothing to actually enumerate registered namespaces.

SimpleXML 库为此提供了 getNamespaces（）方法。 DOMDocument 是否有等效项？

The SimpleXML library has a getNamespaces() method for that. Is there an equivalent for DOMDocument?

推荐答案

DOM没有这样的功能功能afaik。我简要地看过SimpleXml的源代码，我认为它会迭代加载的XML并收集名称空间（我的C语言非常糟糕）。为此，最简单的解决方案是通过将DOM dom导入SimpleXml来获取名称空间。也许是这样的：

DOM does not have such a function afaik. I've looked briefly at the source code of SimpleXml and I think it iterates the loaded XML and collects the namespaces (my C is very bad). The easiest solution would be to fetch the namespaces by importing the DOM dom into SimpleXml for this purpose. Maybe like this:

class DomUtils
{
    public static function getNamespaces($dom)
    {
        $sxe = simplexml_import_dom($dom);
        return $sxe->getNamespaces(); 
    }

    public static function getDocNamespaces($dom)
    {
        $sxe = simplexml_import_dom($dom);
        return $sxe->getDocNamespaces();
    }
}

您也可以尝试使用XPath获取所有名称空间。请参阅以下问题和答案：

You could also try to get all namespaces with XPath. See the following question and answers:

• How to retrieve namespaces in XML files using Xpath

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