public static function getUser($user_id)
 {
     $db = DBManager::get();
     $user = array_shift(User::findByUser_id($user_id));
     $userConfig = UserConfigEntry::findBySQL('field = ' . $db->quote('CALENDAR_SETTINGS') . ' AND user_id = ' . $db->quote($user_id));
     if (!empty($user) || !empty($userConfig)) {
         $data['user'] = $user;
         $data['userConfig'] = $userConfig;
         return $data;
     } else {
         return array();
     }
 }