Forcing download in Safari keeps window open - php

Question

I'm forcing a download on links using this code from the PHP.net site:
if (file_exists($file)) {
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename='.basename($file));
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header('Content-Length: ' . filesize($file));
ob_clean();
flush();
readfile($file);
exit;
}
I put this code in a file called 'download.php', and call it from a page (Click).
It works fine on all browsers, but on Safari the window it opens ('download.php') stays open during and after the download/open process. In other browsers it disappears immediately. Has anyone else come across this problem, and if so are there any suggestions as to how to solve it?

Answer 1

I tried this and it seems to be working equally in all browsers. Try this code, considering that Safari and IE need of more characters as headers to be sent:
#$file = 'load.php';
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename='.basename($file));
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header('Content-Length: ' . filesize($file));
ob_clean();
for($i = 0; $i < 40000; $i++) {
echo ' '; // extra spaces
}
flush();
usleep(50000);
exit;