Download PhpSpreadsheet file without save it before - php-7

Question

I'm using PhpSpreadsheet to generate an Excel file in Symfony 4. My code is:
$spreadsheet = $this->generateExcel($content);
$writer = new Xlsx($spreadsheet);
$filename = "myFile.xlsx";
$writer->save($filename); // LINE I WANT TO AVOID
$response = new BinaryFileResponse($filename);
$response->headers->set('Content-Type', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
$response->setContentDisposition(
ResponseHeaderBag::DISPOSITION_ATTACHMENT,
$filename
);
But I don't want to save the file and then read it to return to the user. I would like to download Excel content directly. Is there a way to do It?
I've searched how to generate a stream of the content (as this answer says) but I hadn't success.
Thanks in advance and sorry about my English

Answer 1

As I understand you are generating the content in your code.
You can stream the response in Symfony and configure PhpSpreadsheet Writer to save to 'php://output' (see here the official doc Redirect output to a client's web browser).
Here is an working example using Symfony 4.1 and Phpspreadsheet 1.3:
<?php
namespace App\Controller;
use PhpOffice\PhpSpreadsheet\Spreadsheet;
use Symfony\Component\HttpFoundation\StreamedResponse;
use Symfony\Component\Routing\Annotation\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use PhpOffice\PhpSpreadsheet\Writer as Writer;
class TestController extends Controller
{
/**
* #Route("/save")
*/
public function index()
{
$spreadsheet = new Spreadsheet();
$sheet = $spreadsheet->getActiveSheet();
$sheet->setCellValue('A1', 'Hello World !');
$writer = new Writer\Xls($spreadsheet);
$response = new StreamedResponse(
function () use ($writer) {
$writer->save('php://output');
}
);
$response->headers->set('Content-Type', 'application/vnd.ms-excel');
$response->headers->set('Content-Disposition', 'attachment;filename="ExportScan.xls"');
$response->headers->set('Cache-Control','max-age=0');
return $response;
}
}

Answer 2

This is the solution for Laravel. But it still uses Symfony\Component\HttpFoundation\StreamedResponse in the end.
$contentDisposition = 'attachment; filename="' . $fileName . '"';
$contentType = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet';
$response = response()->streamDownload(function () use ($spreadsheet) {
$writer = new Xlsx($spreadsheet);
$writer->save('php://output');
});
$response->setStatusCode(200);
$response->headers->set('Content-Type', $contentType);
$response->headers->set('Content-Disposition', $contentDisposition);
Then you can send the response directly as a stream with
$response->send();
or just return it back in the controller
return $response;