function url_base64_decode($code)

{

        if($code=="")

                return "";

    $code=str_replace("!",'+',$code);

    $code=str_replace(",",'/',$code);

    $str=base64_decode($code);

    return $str;

}

$url=url_base64_decode($_GET["url"]);

//....省略

header("Content-type: image/jpeg");

echo file_get_contents($url);