Automatisches Datei-Download

function forceDownload($file)
{
    if ((isset($file))&&(file_exists($file))) {
        header("Content-length: ".filesize($file));
        header('Content-Type: application/octet-stream');
        header('Content-Disposition: attachment; filename="' . $file . '"');
        readfile("$file");
    } else {
        echo "No file selected";
    }
}