DOMElement::getElementsByTagNameNS()

(PHP 5, PHP 7)

Get elements by namespaceURI and localName

说明

publicDOMElement::getElementsByTagNameNS(string $namespaceURI,string $localName): DOMNodeList

This function fetch all the descendant elements with a given$localNameand$namespaceURI.

参数

$namespaceURI

The namespace URI.

$localName

The local name. Use*to return all elements within the element tree.

返回值

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.

参见

• DOMElement::getElementsByTagName() Gets elements by tagname

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.