public function __construct(\SplFileObject $file, $delimiter = ',', $enclosure = '"', $escape = '\\')
    {
        ini_set('auto_detect_line_endings', true);

        $this->file = $file;
        $this->file->setFlags(
            \SplFileObject::READ_CSV |
            \SplFileObject::SKIP_EMPTY |
            \SplFileObject::READ_AHEAD |
            \SplFileObject::DROP_NEW_LINE★これを外すと改行が消えない
        );