original_string: private function rememberVisitorId($row)
      {
          if (!empty($row[self::USER_ID_FIELD]) && !empty($row[self::VISITOR_ID_FIELD])) {
              $this->visitorIdsUserIdsMap[$row[self::USER_ID_FIELD]] = $row[self::VISITOR_ID_FIELD];
          }
      }
code: private function rememberVisitorId($row)
      {
          if (!empty($row[self::USER_ID_FIELD]) && !empty($row[self::VISITOR_ID_FIELD])) {
              $this->visitorIdsUserIdsMap[$row[self::USER_ID_FIELD]] = $row[self::VISITOR_ID_FIELD];
          }
      }
code_tokens: private function rememberVisitorId ( $ row ) { if ( ! empty ( $ row [ self :: USER_ID_FIELD ] ) && ! empty ( $ row [ self :: VISITOR_ID_FIELD ] ) ) { $ this -> visitorIdsUserIdsMap [ $ row [ self :: USER_ID_FIELD ] ] = $ row [ self :: VISITOR_ID_FIELD ] ; } }
docstring: Remember visitor ID per user. We use it to fill metadata before actual inserting rows to DB.
  
  @param array $row
docstring_tokens: Remember visitor ID per user . We use it to fill metadata before actual inserting rows to DB .