Cloudinary::private_download_url PHP Method

    public static function private_download_url($public_id, $format, $options = array())
    {
        $cloudinary_params = Cloudinary::sign_request(array("timestamp" => time(), "public_id" => $public_id, "format" => $format, "type" => Cloudinary::option_get($options, "type"), "attachment" => Cloudinary::option_get($options, "attachment"), "expires_at" => Cloudinary::option_get($options, "expires_at")), $options);
        return Cloudinary::cloudinary_api_url("download", $options) . "?" . http_build_query($cloudinary_params);
    }