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Example on how to download an Excel file created with PhpSpreadsheet
$streamedResponse = new StreamedResponse();
$streamedResponse->setCallback(function () {
$spreadsheet = //create you spreadsheet here;
$writer = new Xlsx($spreadsheet);
$streamedResponse->headers->set('Content-Type', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
$streamedResponse->headers->set('Content-Disposition', 'attachment; filename="your_file.xlsx"');
return $streamedResponse->send();`

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andykillen commented Jul 15, 2019

this really need to have the use statements on this, otherwise its not a solution, only further problems that need to be worked out

use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Writer\Xlsx;
use Symfony\Component\HttpFoundation\StreamedResponse;
use Symfony\Component\HttpFoundation\Response;

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damijanc commented Jul 15, 2019

It was an excerpt from the code, but thank you for pointing it out. I hope that no one will just blindly copy and paste it.

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