Download file using jquery php

header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename='.$_REQUEST['f']);
readfile('../some_folder/some_subfolder/'.$_REQUEST['f']); 
exit;

//You open this php-file via 
window.location.href = 'scripts/this_php_file.php?f=downloaded_file';

Source: stackoverflow.com

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