Phpspreadsheet : Download doesn't work for .csv and .pdf files - excel

Question

I work with the Symfony 4 framework. My goal is to be able to export data with different possible formats (xlsx, ods, csv, pdf).
In my controller, I did like this:
/**
* Permet d'exporter des données.
*
* #Route("rh/export", name="rh_export")
*/
public function export(Request $request, ExportService $exportService)
{
$exportExcel = new ExportExcel();
$form = $this->createForm(ExportExcelType::class, $exportExcel);
$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
$spreadsheet = $exportService->export($exportExcel);
switch($exportExcel->getExtension())
{
case "xlsx":
$writer = new Xlsx($spreadsheet);
break;
case "csv":
$writer = new Csv($spreadsheet);
break;
case "ods":
$writer = new Ods($spreadsheet);
break;
case "pdf":
$writer = new Dompdf($spreadsheet);
break;
default:
$writer = new Xlsx($spreadsheet);
break;
}
if($exportExcel->getExtension() === "pdf")
{
$writer->writeAllSheets();
}
// Create a Temporary file in the system
$fileName = $exportExcel->getNomFichier().'.' . $exportExcel->getExtension();
$temp_file = tempnam(sys_get_temp_dir(), $fileName);
// Create the excel file in the tmp directory of the system
$writer->save($temp_file);
// Return the excel file as an attachment
return $this->file($temp_file, $fileName, ResponseHeaderBag::DISPOSITION_INLINE);
}
return $this->render('rh/export.html.twig', [
'form' => $form->createView(),
]);
}
I analyze the submission of the form.
I create the spreadsheet
Depending on the type of file desired, I initialize the $writer
Create a Temporary file in the system
Create the excel file in the tmp directory of the system
Return the excel file as an attachment
The strange thing is that when the file type is .xlsx or .ods, the file downloads correctly.
However if it is .csv or .pdf, then the file is not downloaded, and instead it opens in my browser
EDIT : I resolved my problem with :
Replace :
// Create a Temporary file in the system
$fileName = $exportExcel->getNomFichier().'.' . $exportExcel->getExtension();
$temp_file = tempnam(sys_get_temp_dir(), $fileName);
// Create the excel file in the tmp directory of the system
$writer->save($temp_file);
// Return the excel file as an attachment
return $this->file($temp_file, $fileName, ResponseHeaderBag::DISPOSITION_INLINE);
by
$response = new StreamedResponse(
function () use ($writer) {
$writer->save('php://output');
}
);
$fileName = $exportExcel->getNomFichier().'.' . $exportExcel->getExtension();
$response->headers->set('Content-Type', 'application/vnd.ms-excel');
$response->headers->set('Content-Disposition', sprintf('attachment;filename="%s"', $fileName));
$response->headers->set('Cache-Control','max-age=0');
return $response;