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In a custom module I create a file and then use drupal_goto to download it. How can I delete the file after it is downloaded? Placing a file_unmanaged_delete after the drupal_goto doesn't get executed, and hook_file_download happens before the download for permissions checks and such. So I'm not sure how to do this. Do I have to resort to cleaning up files in a folder with cron somehow?

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    Use file transfer and file delete function instead. – Shabir A. Oct 28 '15 at 17:45
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    @Shabir Could you post an example of this or give more info? I don't understand yet – digitgopher Oct 28 '15 at 17:55
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    Does the answer solve the issue? – Shabir A. Oct 28 '15 at 19:51
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    @Shabir I did not get it to work. I am also uncomfortable using those low-level php functions, and drupal_add_http_header just doesn't seem like a good solution. As a workaround to not having a post-download hook or another callback somewhere, I've created these files in a special directory that I just wipe with hook_cron. – digitgopher Oct 28 '15 at 20:01
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The following code will remove the file after download considering that your file is located in tmp directory.

$filename = 'foobar.xls';
$temp_path = realpath(file_directory_temp()) . '/';
if (file_exists($temp_path . $filename)) {
  // Serve file download.
  drupal_add_http_header('Pragma', 'public');
  drupal_add_http_header('Expires', '0');
  drupal_add_http_header('Cache-Control', 'must-revalidate, post-check=0, pre-check=0');
  drupal_add_http_header('Content-Type', 'application/vnd.ms-excel');
  drupal_add_http_header('Content-Disposition', 'attachment; filename=' . basename($temp_path . $filename) . ';');
  drupal_add_http_header('Content-Transfer-Encoding', 'binary');
  drupal_add_http_header('Content-Length', filesize($temp_path . $filename));
  readfile($temp_path . $filename);
  unlink($temp_path . $filename);
  drupal_exit();
}

You can visit the following link for details http://kahthong.com/2012/08/simple-example-how-use-drupal-serve-file-downloads

Thanks!

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    While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. – Shawn Conn Oct 28 '15 at 19:42
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    I have edited my answer. – Shabir A. Oct 28 '15 at 19:48
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// Generate pdf card.
$file_path = $crm_card->generatePdfCard();
$filename = basename($file_path);
$headers = [
  'Content-Type' => 'application/octet-stream',
  'Content-Disposition' => 'attachment; filename="' . $filename . '"',
  'Content-Length' => filesize($file_path),
];

$binary_file_response = new BinaryFileResponse($file_path, 200, $headers);
$binary_file_response->deleteFileAfterSend(TRUE);

return $binary_file_response;

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