symfony huge file download - php

Question

I have controller in Symfony2, which provides file download.
/**
* #Route("/polynomy/download/{polynomialId}", name="download_polynomial")
*/
public function polynomialDownloadAction( $polynomialId ) {
$em = $this->get('doctrine')->getManager();
$polynomial = $em->getRepository('AppBundle:Polynomial')->findById($polynomialId);
$filename = $polynomial->getFileLocation();
$response = new Response();
$response->headers->set('Cache-Control', 'private');
$response->headers->set('Content-type', mime_content_type($filename));
$response->headers->set('Content-Disposition', 'attachment; filename="'.basename($filename).'";');
$response->headers->set('Content-length', filesize($filename));
$response->sendHeaders();
$response->setContent(readfile($filename));
return $this->redirect($this->generateUrl('users_polynomials'));
}
This work just fine for small files (<100MB). But if I want to download file greater than 100MB I get an error (ERR_INVALID_RESPONSE).
I found, that problem is probably in php function readfile(), which causes memory exhaustion.
Is there a way in Symfony 2.6.1 how to download huge files without memory exhaustion?

Answer 1

Sure. You want to use Symfony\Component\HttpFoundation\BinaryFileResponse.
$response = new BinaryFileResponse($filename);
That will also take care of headers for you automatically (though of course you can add more headers if needed).

Answer 2

Download large file using symphony. This code streams the file.
$response = new StreamedResponse();
$i = -999999;
$response->setCallback(function () {
while($i < 999999){
echo '{"G1ello":"hualala"}';
$i = $i + 1;
}
});
$filename = "Data.json";
$contentDisposition = $response->headers->makeDisposition(ResponseHeaderBag::DISPOSITION_ATTACHMENT, $filename);
$response->headers->set('Content-Type', 'application/json');
$response->headers->set('Content-Disposition', $contentDisposition);
return $response;
It created a large file which I was able to download.