public static function getCampaignParameters()
    {
        $return = array(
            Config::getInstance()->Tracker['campaign_var_name'],
            Config::getInstance()->Tracker['campaign_keyword_var_name'],
        );

        foreach ($return as &$list) {
            if (strpos($list, ',') !== false) {
                $list = explode(',', $list);
            } else {
                $list = array($list);
            }
            $list = array_map('trim', $list);
        }

        return $return;
    }