How to Force File Downloads in PHP: Handling Remote Files?

Forcing File Downloads in PHP: Handling Remote Files

Forcing file downloads instead of opening them in-browser can be crucial for media files. To handle this scenario, where videos reside on a separate server, PHP offers a solution that involves manipulating HTTP headers.

// Locate the file.
$file_name = 'file.avi';
$file_url = 'http://www.myremoteserver.com/' . $file_name;

// Configure HTTP headers for forced download.
header('Content-Type: application/octet-stream');
header("Content-Transfer-Encoding: Binary");
header("Content-disposition: attachment; filename=\"". $file_name . "\"");

// Initiate the download process.
readfile($file_url);

// Terminate the script to prevent any further output.
exit;

By setting the Content-Type as application/octet-stream, we indicate that the file is a binary stream for downloading. Content-Transfer-Encoding: Binary ensures that the file's binary format remains intact. Finally, Content-disposition with attachment ensures that the user is prompted to download the file instead of opening it in the browser.

Note that readfile requires fopen_wrappers to be enabled to access files from a remote URL. By utilizing this technique, you can effectively force the download of files stored on a separate server, providing a more user-friendly experience for your website visitors.

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