Please try using this CVS snapshot:

  http://snaps.php.net/php5.2-latest.tar.gz
 
For Windows:
 
  http://snaps.php.net/win32/php5.2-win32-latest.zip

No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".

The latest snapshot doesn't fix the problem, the returned error message is still the same.

Fix your server code:

class testService {
  public function authUser($authToken) {
    return array(
      'firstName' => strtolower($authToken),
      'lastName' => strtoupper($authToken)
    );
  }
}

class testService2 {
  public function authUser($authToken) {
    $r = new objUserDetails();
    $r->firstName = strtolower($authToken);
    $r->lastName = strtoupper($authToken);
    return $r;
  }
}

Even fixed as asked, the server still returns the same error.

You probably did somthing wrong. I verified this code before sending it to you.

No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".

dmitry you're saying the server code is wrong, what's wrong with it?

Is the code you posted a correction or taken from the file linked in the original post - the code is identical now but I can't tell if the file has been changed since the original posting to be what you posted as a correction, or if you are pointing out incorrect code.