Forzar la descarga de un fichero en php

Con esta función podemos forzar la descarga de un fichero al navegador.

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print?

1	function downloadFile($file){

2	$file_name = $file;

3	$mime = 'application/force-download';

4	header('Pragma: public');     // required

5	header('Expires: 0');        // no cache

6	header('Cache-Control: must-revalidate, post-check=0, pre-check=0');

7	header('Cache-Control: private',false);

8	header('Content-Type: '.$mime);

9	header('Content-Disposition: attachment; filename="'.basename($file_name).'"');

10	header('Content-Transfer-Encoding: binary');

11	header('Connection: close');

12	readfile($file_name);        // push it out

13

exit();

14

}