使用Silex / Symfony提交响应后删除文件

Question

I'm generating a pdf using Knp\Snappy\Pdf in my Silex application. the file name is random and saved to the tmp directory.

$filename = "/tmp/$random.pdf"
$snappy->generate('/tmp/body.html', $filename, array(), true);

I think return the pdf in the response,

$response = new Response(file_get_contents($filename));
$response->headers->set('Pragma', 'public');
$response->headers->set('Content-Type', 'application/pdf');

return $response;

The pdf is displayed in the web browser correctly. The file with the random filename still exists when the request is finished. I can't unlink the file before returning the response. I've tried registering a shutdown function with register_shutdown_function and unlinking the file from there. However that doesn't seem to work. Any ideas?

Answer 1

You can use the finish middleware for that:

A finish application middleware allows you to execute tasks after the Response has been sent to the client (like sending emails or logging)

This is how it could look:

$app->finish(function (Request $request, Response $response) use ($app) {
    if (isset($app["file_to_remove"])) {
        unlink($app["file_to_remove"];
    }
});

//in your controller
$app["file_to_remove"] = $filename;