public function get_params($cid) {
        global $DB;
        $params = array();

        $records = $DB->get_records('badge_criteria_param', array('critid' => $cid));
        foreach ($records as $rec) {
            $arr = explode('_', $rec->name);
            $params[$arr[1]][$arr[0]] = $rec->value;
        }

        return $params;
    }