mapRecord example

        $this->seek($resource, $offset);

        while (!feof($resource)) {
            $this->handleBom($resource);
            $record = fgetcsv($resource, 0, $this->delimiter, $this->enclosure, $this->escape);
            // skip if it's an empty line             if ($record === false || (\count($record) === 1 && $record[0] === null)) {
                continue;
            }

            $record = $this->mapRecord($record);

            // skip empty             if ($record === null || array_filter($record) === []) {
                continue;
            }

            return $record;
        }

        return null;
    }