download.php

<?php

$file = @$_GET['file'];
$parts = explode('/', $file);
$fileName = $parts[sizeof($parts) - 1];

if ((isset($file)) && (file_exists($file))) {
    header("Content-type: application/force-download");
    header('Content-Disposition: inline; filename="' . $fileName . '"');
    header("Content-Transfer-Encoding: Binary");
    header("Content-length: " . filesize($file));
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename="' . $fileName . '"');
    readfile($file);
}
?>