code: protected function loadDepartureDaysOutIn(PriceXplorerExtremeSearchOptions $params)
      {
          if (!empty($params->departureDaysInbound)) {
              $this->departureDays[] = new DepartureDays(
                  $params->departureDaysInbound,
                  SelectionDetails::OPT_INBOUND_DEP_DAYS
              );
          }
          if (!empty($params->departureDaysOutbound)) {
              $this->departureDays[] = new DepartureDays(
                  $params->departureDaysOutbound,
                  SelectionDetails::OPT_OUTBOUND_DEP_DAYS
              );
          }
      }
docs: @param PriceXplorerExtremeSearchOptions $params