User Files function getDownloads()

function getDownloads(){

    if (isset($_GET['theDLfile'])){
        $file = $_GET['theDLfile'];
        $upload_dir = wp_upload_dir();
        global $current_user;
        get_currentuserinfo();

        $url=$upload_dir['basedir'].'/file_uploads/'.$current_user->ID .'/';

        if (isset($_GET['page'])) {
            if ($_GET['page']=="manage-files-main") $url=$upload_dir['basedir'].'/file_uploads/';   // the user folder is in  $file
        }
        $filename = $url.$file ;

        if (!file_exists($filename)) {
                die("file not found: ". $file);
        }   else    {

            $fileNM = str_replace(" ","_",$file);

            $file_extension = strtolower(substr(strrchr($filename,"."),1));
            switch ($file_extension) {
                case "pdf": $ctype="application/pdf"; break;
                case "exe": $ctype="application/octet-stream"; break;
                case "zip": $ctype="application/zip"; break;
                case "doc": $ctype="application/msword"; break;
                case "xls": $ctype="application/vnd.ms-excel"; break;
                case "ppt": $ctype="application/vnd.ms-powerpoint"; break;
                case "gif": $ctype="image/gif"; break;
                case "png": $ctype="image/png"; break;
                case "jpe": case "jpeg":
                case "jpg": $ctype="image/jpg"; break;
                default: $ctype="application/force-download";
            }

           header("Pragma: public");
            header("Expires: 0");
            header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
            header("Cache-Control: private",false);
            header("Content-Type: $ctype");
            header("Content-Disposition: attachment; filename=\"".basename($filename)."\";");
            header("Content-Transfer-Encoding: binary");
            header("Content-Length: ".@filesize($filename));
            set_time_limit(0);
            @readfile("$filename") or die("File not found.");
        }
    }
    return;
}