// AuthenticateMember;
$client_userName = '117124';
$client_password = '175853530';

try {
    $isAlive = $soapclient->AuthenticateMember(array(
        'auth' => new SoapVar(
          array(
            'UserName' => $client_userName,
            'Pwd' => $client_password
          ),
          SOAP_ENC_OBJECT,
          'MemberAuthentication',
          'http://schemas.datacontract.org/2004/07/ConstructionFederation'
        ),
        'userName' => CONST_WS_USERNAME,
        'password' => CONST_WS_PASSWORD
      ));
} catch (Exception $e) {
    echo 'Caught exception: ',  $e->getMessage(), "\n";
}