DOMElement::getElementsByTagNameNS

(PHP 5, PHP 7, PHP 8)

DOMElement::getElementsByTagNameNS — Get elements by namespaceURI and localName

Description

public DOMElement::getElementsByTagNameNS(?string $namespace, string $localName): DOMNodeList

This function fetch all the descendant elements with a given localName and namespace.

Parameters

namespace: The namespace URI of the elements to match on. The special value "*" matches all namespaces. Passing null matches the empty namespace.
localName: The local name of the elements to match on. The special value "*" matches all local names.

Return Values

This function returns a new instance of the class DOMNodeList of all matched elements in the order in which they are encountered in a preorder traversal of this element tree.

Changelog

Version	Description
8.0.3	`namespace` is nullable now.

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User Contributed Notes 1 note

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spam at chovy dot com ¶

15 years ago

I had some difficulty stripping all default NS attributes for an ns-uri in one shot, the following will work though...first strip the documentElement namespace, then getElementsByTagNameNS() -- the documentation should reflect that the 2nd argument is actually the name of the tag, not the local namespace prefix as I first expected:

<?php

function strip_default_ns( $xml = null, $ns_uri = 'http://example.com/XML-Foo' ) {
    $ns_local = '';
    $ns_tag = '*';
    
    if ( empty($xml) ) return false;
    
    //remove document namespace
    $dom = new DOMDocument();
    $dom->loadXML($xml);
    $dom->documentElement->removeAttributeNS($ns_uri, $ns_local);
    
    //strip element namespaces
    foreach ( $dom->getElementsByTagNameNS($ns_uri, $ns_tag) as $elem ) {
        $elem->removeAttributeNS($ns_uri, $ns_local);
    }

    return $dom->saveXML();
}

$stripped_xml = strip_default_ns($the_xml);

?>

$stripped_xml can now take advantage of running XPath queries on it for the NULL namespace.