xiunoPHP实现同步登陆

<?php$action = param(1);if($action == login) {
         
        $_SESSION[referer] = http_referer();
         
        // 发起的 token
        $token = xn_encrypt($time."\t".$useragent);
        $s = xn_decrypt($token);
        $return_url = xn_urlencode(http_url_path().url(user-synlogin));
        http_location(BBS_URL."user-synlogin.htm?token=$token&return_url=$return_url");
         // 接受跳转回来的 token} elseif($action == synlogin) {
         
        $token = param(token);
        $s = xn_decrypt($token);
        $arr = xn_json_decode($s);
        empty($arr) AND message(-1, TOKEN 有错误);
         
        $_SESSION[uid] = $arr[uid];
        $_SESSION[user] = $arr;
         
        $referer = $_SESSION[referer];
        unset($_SESSION[referer]);
         
        message(-1, jump(登陆成功, $referer, 2));
         } elseif($action == create) {
         
        http_location(BBS_URL.url("user-create"));
         } elseif($action == logout) {
         
        $uid = 0;
        unset($_SESSION[uid]);
        unset($_SESSION[user]);
        message(-1, jump(退出成功, http_referer(), 2));
         }?>