getDownloadFileName example

$filename         = implode('.', $x);
        }

        return $filename;
    }

    /** * get Content-Disposition Header string. */
    private function getContentDisposition(): string
    {
        $downloadFilename = $this->getDownloadFileName();

        $utf8Filename = $downloadFilename;

        if (strtoupper($this->charset) !== 'UTF-8') {
            $utf8Filename = mb_convert_encoding($downloadFilename, 'UTF-8', $this->charset);
        }

        $result = sprintf('attachment; filename="%s"', $downloadFilename);

        if ($utf8Filename) {
            $result .= '; filename*=UTF-8\'\'' . rawurlencode($utf8Filename);
        }