public static function quiz_get_random_question($cat_id, $used_ids)
 {
     global $CFG, $DB;
     $params = self::validate_parameters(self::quiz_get_random_question_parameters(), array('cat_id' => $cat_id, 'used_ids' => $used_ids));
     $auth = new auth_plugin_joomdle();
     $id = $auth->quiz_get_random_question($cat_id, $used_ids);
     return $id;
 }