public function getUserdata($keyword, $user_id = null)
 {
     return json_encode(['data' => Watchdog::queryUserInfo($keyword, $user_id)]);
 }
 /**
  * @author Aunne
  * @param $facebook_id
  * @param int $limit
  * @return JSON containing the industries view/searched by user
  */
 public function getUserIndustryInfo($facebook_id, $limit = 10)
 {
     try {
         $user_id = User::getUserIdByFbId($facebook_id);
     } catch (Exception $e) {
         $user_id = null;
     }
     if ($user_id) {
         $industry_data = Watchdog::queryUserInfo('industry', $user_id);
         unset($industry_data['Industry']);
         //remove industry index since this is useless data caused by searching without industry parameter
         arsort($industry_data);
         $industry_data = array_slice($industry_data, 0, $limit);
         return json_encode(['industries' => $industry_data]);
     } else {
         return json_encode(['error' => 'You are not registered to FeatherQ.']);
     }
 }