public function getFunctions()
    {
        if ($this->getWsdl() == null) {
            require_once 'Zend/Soap/Client/Exception.php';
            throw new Zend_Soap_Client_Exception('\'getFunctions\' method is available only in WSDL mode.');
        }

        $soapClient = $this->getSoapClient();
        return $soapClient->__getFunctions();
    }