Downloader.php

<?php
class DownloaderComponent extends Object
{
    public function sendFileHeaders($path)
    {
        $handle      = finfo_open(FILEINFO_MIME_TYPE);
        $contentType = finfo_file($handle, $path);
        $extension   = path_info($path, PATHINFO_EXTENSION); //Better way to get the extension

        header("Pragma: public");
        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: $contenttype");
        header("Content-Disposition: attachment; filename=\"" . basename($path) . "\";");
        header("Content-Transfer-Encoding: binary");
        readfile($path);
    }
}