How to force file download with PHP

Read the docs about built-in PHP function readfile

header('Content-Type: application/octet-stream');
header("Content-Transfer-Encoding: Binary"); 
header("Content-disposition: attachment; filename=\"" . basename($file_url) . "\""); 

Also make sure to add proper content type based on your file application/zip, application/pdf etc. – but only if you do not want to trigger the save-as dialog.

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