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(PHP 5, PHP 7)
DOMElement::getElementsByTagName — Gets elements by tagname
$name 
   )
   This function returns a new instance of the class
   DOMNodeList of all descendant elements with a
   given tag name, in the order in which they are
   encountered in a preorder traversal of this element tree. 
  
name The tag name. Use * to return all elements within the element tree.
This function returns a new instance of the class DOMNodeList of all matched elements.
[#1] ddkkdd twenty twenty at gmail dot com [2010-09-08 15:15:33]
A simple function that uses this method to print the nodes it finds in an xml document. Improvements welcomed.
<?php
function printTags($tag){
  $node = $this->doc->getElementsByTagName($tag);           
   for($c = 0; $c<$node->length; $c++){
     $text[$c] =$this->doc->saveXML($node->item($c));
     echo $text[$c];
   }
  
}
?>