Website/paste/download.php

<?php

if (file_exists("/var/www/kxstudio/paste/"))
    $base_dir = "/var/www/kxstudio/paste/";
else
    $base_dir = "/home/groups/k/kx/kxstudio/htdocs/paste/";

function downloadFile($fullPath) {
    // Must be fresh start
    if(headers_sent())
        die('Headers Sent');

    // Required for some browsers
    if(ini_get('zlib.output_compression'))
        ini_set('zlib.output_compression', 'Off');

    $fsize = filesize($fullPath);

    header("Pragma: public"); // required
    header("Expires: 0");
    header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
    header("Cache-Control: private",false); // required for certain browsers
    header("Content-Type: application/force-download");
    header("Content-Disposition: attachment; filename=\"".basename($fullPath)."\";" );
    header("Content-Transfer-Encoding: binary");
    header("Content-Length: ".$fsize);
    ob_clean();
    flush();
    readfile($fullPath);
}

if (!empty($_GET["id"])) {
    $paste_id   = htmlspecialchars($_GET["id"]);
    $paste_file = $base_dir . "repo/" . $paste_id;

    if (!file_exists($paste_file)) die("File does not exist");

    downloadFile($paste_file);
}

?>