目前只支持cas2.0

    $cas = new \PhpCasCore\Cas(env("CAS_SERVER"), env("CAS_PATH"));
    $func = function ($url) {
        getGouuseCore()->ResponseLib->redirect($url);
    };
    //回调的地址
    $cas->callBackUrl("http://127.0.0.1/user_center/auth-cas");
    //需要携带的参数
    $cas->setQueryString($request->getQueryString() ?? "");
    $cas->setRequest($request->input(), $request->server());
    $cas->setRedirectCall($func);
    try {
        $user = $cas->isAuthenticated();
        if ($user) {
            //单点登录成功
        }
     } catch (\Exception $e) {
     
     }
     //单点登录失败