if (isset($_POST['submit'])) {

        $destination_folder = 'images/user_avatars/temp/';
        $url = $_POST['avatar_url'];
        $newfname = $destination_folder . "user_" . $_SESSION[user_id];

        $file = fopen ($url, "rb");
        if ($file) {
            $newf = fopen ($newfname, "wb");
            if ($newf)
                while(!feof($file)) {
                    fwrite($newf, fread($file, 1024 * 8 ), 1024 * 8 );
                }
            }
        }

        echo filesize($newfname);

        if ($file) {
            fclose($file);
        }

        if ($newf) {
            fclose($newf);
        }
    }