Php soap service evenlope <return> element

I am trying to build a web service to a specification of a 3rd party who will be connecting to it as a client, the service must be written in PHP but I am a total PHP n00b so struggling a little. Basically my responses are being wrapped in a element however the client is not accepting my responses because of this, here is an example.

service.php

<?php


class MyService {

    public function Ping() {
        return date('d/m/Y H:i:s');
    }

}


$server = new SoapServer(null, array( 'soap_version' => SOAP_1_2, 'encoding' => 'UTF-8', 'uri' => 'http://tempuri.org/'));
$server->setClass("MyService");
$server->handle();

?>

Request

<soapenv:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
        xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
        xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" 
        xmlns:tem="http://tempuri.org/">
   <soapenv:Header/>
   <soapenv:Body>
      <tem:Ping />
   </soapenv:Body>
</soapenv:Envelope>

Response

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas开发者_如何学JAVA.xmlsoap.org/soap/envelope/" xmlns:ns1="http://tempuri.org/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/">
   <SOAP-ENV:Body>
      <ns1:PingResponse>
         <return xsi:type="xsd:string">18/11/2010 18:51:02</return>
      </ns1:PingResponse>
   </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

What the client is expecting is the PingResponse to just contain the date but without the wrapped around the outside. How can I get the PHP SoapClient to do this?

E.g.

<ns1:PingResponse>18/11/2010 18:51:02</ns1:PingResponse>

I don't think you can, I think this is written into the core of SOAP so it's something your client will have to work around. If they're already getting the contents of PingResponse I can't see it being much more difficult for them to go 1 tree deeper into the response.