Description:
------------
I get a strange problem when creating a web-service. The second call on the web-service crashes.


Reproduce code:
---------------
<?php
  include_once("Log.php5);

  class SOAPSMSServer
  {
    function __construct() {
      $this->objLog = new Log();
    }
    
    public function method1() {
      $this->objLog->log("Method 1 called");
    }

    public function method2() {
      $this->objLog->log("Method 2 called"); // << crashes
  }

  $soapServer = new SoapServer('SOAPSMSServer.wsdl');
  $soapServer->setClass('SOAPSMSServer');
  $soapServer->addFunction(array('method1','method2'));
  $soapServer->setPersistence(SOAP_PERSISTENCE_SESSION);
  $soapServer->handle();
?>


Expected result:
----------------
In my opinion the script should do following:
a) Client connects to SOAP-Server
b) Server executes __construct()
c) Server executes method1()
     calls the log-method
d) Server executes method2()
     calls the log-method

The client is ok - it works if I disable logging.

Actual result:
--------------
The error is:
"The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition "Log" of the object you are trying to operate on was loaded _before_ unserialize() gets called or provide a __autoload() function to load the class definition"