PHP: retrieve all declared namespaces of a DOMElement - php

Question

I am using the DOM extension to parse an xml file containing xml namespaces. I would have thought that namespace declarations are treated just like any other attribute, but my tests seem to disagree. I have a document that starts like this:
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns="http://purl.org/rss/1.0/"
xmlns:taxo="http://purl.org/rss/1.0/modules/taxonomy/"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:syn="http://purl.org/rss/1.0/modules/syndication/"
xmlns:prism="http://purl.org/rss/1.0/modules/prism/"
xmlns:admin="http://webns.net/mvcb/"
>
And a test code like this:
$doc = new DOMDocument();
$doc->loadXml(file_get_contents('/home/soulmerge/tmp/rss1.0/recent.xml'));
$root = $doc->documentElement;
var_dump($root->tagName);
# prints 'string(7) "rdf:RDF"'
var_dump($root->attributes->item(0));
# prints 'NULL'
var_dump($root->getAttributeNode('xmlns'));
# prints 'object(DOMNameSpaceNode)#3 (0) {}'
So the questions are:
Does anyone know where could I find the documentation of DOMNameSpaceNode? A search on php.net does not yield any useful result.
How do I extract all those namespace declarations from that DOMElement?

Answer 1

Unless there is a more direct way you can use XPath and its namespace axis.
e.g.
<?php
$doc = new DOMDocument;
$doc->loadxml('<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns="http://purl.org/rss/1.0/"
xmlns:taxo="http://purl.org/rss/1.0/modules/taxonomy/"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:syn="http://purl.org/rss/1.0/modules/syndication/"
xmlns:prism="http://purl.org/rss/1.0/modules/prism/"
xmlns:admin="http://webns.net/mvcb/"
>
...
</rdf:RDF>');
$context = $doc->documentElement;
$xpath = new DOMXPath($doc);
foreach( $xpath->query('namespace::*', $context) as $node ) {
echo $node->nodeValue, "\n";
}
prints
http://www.w3.org/XML/1998/namespace
http://webns.net/mvcb/
http://purl.org/rss/1.0/modules/prism/
http://purl.org/rss/1.0/modules/syndication/
http://purl.org/dc/elements/1.1/
http://purl.org/rss/1.0/modules/taxonomy/
http://purl.org/rss/1.0/
http://www.w3.org/1999/02/22-rdf-syntax-ns#
edit and btw: I haven't found documentation for DOMNameSpaceNode either. But you can "deduct" (parts of) its functionality from the source code in ext/dom/php_dom.c
It doesn't seem to expose any methods and exposes the properties
"nodeName", "nodeValue", "nodeType",
"prefix", "localName", "namespaceURI",
"ownerDocument", "parentNode"
all handled by the same functions as the corresponding DOMNode properties.

Answer 2

Note, that
echo $root->getAttributeNode('xmlns')->nodeValue . "\n";
echo $root->getAttribute('xmlns') . "\n";
echo $root->getAttribute('xmlns:syn') . "\n";
all work as expected, and print out
http://purl.org/rss/1.0/
http://purl.org/rss/1.0/
http://purl.org/rss/1.0/modules/syndication/
because DOMNameSpaceNode is a Node, not a NodeCollection.
Just clarifying, that, unless something in PHP DOM extension changes, XPath (as explained by VolkerK) is the only native way to get all the namespaces, regardless of documentation.