Forcing file download in PHP corrupts zip files

Question

My PHP script forces a file to download, which all works fine, but when forcing zip files to download, they corrupt.

When I try and open the zip file locally it just converts from a .zip to a .zip.cpgz

If I download the file from a direct URL the zip file is fine, so I know it's only corrupting during the push/download phase.

Here's my code

    header("Content-Type: application/octet-stream");
    header("Content-Disposition: attachment; filename=\"_zip_download.zip\"");
    header("Content-Transfer-Encoding: Binary"); 
    header("Content-Description: File Transfer");
    header("Content-Length: " . filesize($zip_file));

possible duplicate of [How to force file download with PHP](http://stackoverflow.com/questions/7263923/how-to-force-file-download-with-php) — e4c5, Aug 21 '15 at 00:07

score 1 · Answer 1 · answered Aug 20 '15 at 23:58

1

For zip file you can set header("Content-Type: application/zip");

header("Content-Type: application/zip");
header("Content-Disposition: attachment; filename=\"_zip_download.zip\"");
header("Content-Length: " . filesize($zip_file));
readfile($zip_file);
exit;

answered Aug 20 '15 at 23:58

Valery Viktorovsky

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Unfortunately that has made no difference. – Daniel Williams Aug 21 '15 at 00:55
Do you use `readfile` function? Can you try to download file in different browser? – Valery Viktorovsky Aug 21 '15 at 00:59
1

I've managed to solve the problem. It was an issue with headers being sent before the file. – Daniel Williams Aug 21 '15 at 02:00
Excuse me @DanielWilliams but headers are supposed to be sent before the file. – e4c5 Aug 21 '15 at 13:46
I mean, there was something else being printed to screen before PHP sent headers. – Daniel Williams Aug 23 '15 at 22:46

Forcing file download in PHP corrupts zip files

1 Answers1