Problems getting the nodeName with DomDocument

[Kenneth Andresen <kandresen@xxxxxxx>]

I am having problems with the following functions where my return simply 
is "#text Joe #text Smith #text unknown", it should have read
firstname Joe lastname Smith address unknown

What am I doing wrong?


<?php
$xmlstring = 
"<element><firstname>Joe</firstname><lastname>Smith</lastname><address>unknown</address></element>";

$domdoc = new DomDocument();
$domdoc->loadXML($xmlstring);
$domroot = $domdoc->documentElement;

function process_children($node)
{
   $children = $node->childNodes;
   foreach ($children as $elem) {
       if ($elem->nodeType == XML_TEXT_NODE) {
           if (strlen(trim($elem->nodeValue))) {
               $name = $elem->nodeName ;
               $res = mb_convert_encoding(trim($elem->nodeValue), 
'html', 'utf-8');
               echo "$name  $res \n";    
           }
       } else if ($elem->nodeType == XML_ELEMENT_NODE) {
           process_children($elem);
       }
   }
}

process_children($domroot);

?>

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