xml_remove_elementsByTagName($parentNode,$tagName)

/**
* Removes elements by tag name.
*
* @param object $parentNode.
* @param object $tagName.
* @return object.
*/
function xml_remove_elementsByTagName($parentNode,$tagName){

$nodes = $parentNode->get_elements_by_tagname($tagName);

if(count($nodes)>0){
while(list($key,$node)=each($nodes)){
$parentNode->remove_child($node);
}
}

return $parentNode;

}