/**
 * add subcriber
 *
 * @param $list_id
 * @param $email
 * @return bool
 */
function cw_vertical_response_add_subcriber($list_id, $email)
{
    global $config;
    $vertical_response_email = trim($config[vertical_response_addon_name]['vertical_response_email']);
    $vertical_response_password = trim($config[vertical_response_addon_name]['vertical_response_password']);
    try {
        $vr = new SoapClient(vertical_response_wsdl, array('connection_timeout' => 5));
        $sid = $vr->login(array('username' => "{$vertical_response_email}", 'password' => "{$vertical_response_password}", 'session_duration_minutes' => vertical_response_ses_time));
        $vr->addListMember(array('session_id' => $sid, 'list_member' => array('list_id' => $list_id, 'member_data' => array(array('name' => 'email_address', 'value' => $email)))));
    } catch (SoapFault $exception) {
        //exit ('fault: "' . $exception->faultcode . '" - ' . $exception->faultstring . "\n");
        return false;
    }
    return true;
}