Description:
------------
Call a webservice method. Method returns one value, a string. SoapClient internally tries to convert an instance of stdClass into a string before trying to return the value, thus nothing works.

Reproduce code:
---------------
$packet = array('sessionToken' => $this->searchAuth, 'userId' => '-1', 'expirationDate' => '2008-11-01');
// $this->soap is instance of SoapClient
$results = $this->soap->__soapCall('GenerateToken',array($packet));
var_dump($results);

Webservice returns:
<?xml version="1.0" encoding="utf-8"?>
<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">
  <soap12:Body>
    <GenerateTokenResponse xmlns="~/WebServices/">
      <GenerateTokenResult>string</GenerateTokenResult>
    </GenerateTokenResponse>
  </soap12:Body>
</soap12:Envelope>



Expected result:
----------------
A string containing the value of "GeneratTokenResult"

OR

class stdClass
{
    public $GenerateTokenResult = 'someKindOfToken';
}

Actual result:
--------------
Catchable fatal error: Object of class stdClass could not be converted to string

error is thrown on the line with __soapCall().