PHP: force a confirmation dialog in the browser when downloading a file

Trick source: http://ca.php.net/manual/en/function.header.php Example 1570.

If you want the user to be prompted to save the data you are sending, such as a generated PDF file, you can use the » Content-Disposition header to supply a recommended filename and force the browser to display the save dialog.

   
<?php
    // We'll be outputting a PDF
    header('Content-type: application/pdf');
    
    // It will be called downloaded.pdf
    header('Content-Disposition: attachment; filename="downloaded.pdf"');
    
    // The PDF source is in original.pdf
    readfile('original.pdf');
?>