XML中的NodeValue没有使用XPATH DOM进行更新

Question

I am trying same approach to update the node value but XML is never getting updated. I don't get any errors also. Have tried almost all options:(Need help!!!

$queryResult = $xpath->query("//USER[@EMAIL_ID='$dbEmail']");

 foreach($queryResult as $result)
 {
     foreach ($result->getElementsByTagName('NAME') as $tempName) {
          $tempName->nodeValue = "changed";                                
 }


}