- var_dump: documentation ( source)
<?php
$response = "<LeadResponse xmlns=http://tempuri.org/><LeadId>0</LeadId><Error>Invalid Home Telephone.<br>Invalid Mobile Phone.<br></Error></LeadResponse>";
$xml = new SimpleXMLElement($response);
$leadID = (string)$xml->LeadResponse->LeadId;
var_dump($leadID);