Facebook PHP SDK-如何获得长寿命页面访问令牌

有这样的代码，它可以工作：

        $appsecretProof = hash_hmac('sha256', $shortLivedToken, $secret);
        //init curl
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
        curl_setopt($ch, CURLOPT_TIMEOUT, 60);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        curl_setopt($ch, CURLOPT_USERAGENT, 'facebook-php-3.2');
        //get extended user access token
        $url = 'https://graph.facebook.com/oauth/access_token?grant_type=fb_exchange_token' .
            '&client_id=' . $appId .
            '&client_secret=' . $secret .
            '&fb_exchange_token=' . $shortLivedToken .
            '&appsecret_proof=' . $appsecretProof;
        curl_setopt($ch, CURLOPT_URL, $url);
        $curlResult = curl_exec($ch);
        $response_params = [];
        parse_str($curlResult, $response_params);
        $extendedUserToken = $response_params['access_token'];
        $appsecretProof = hash_hmac('sha256', $extendedUserToken, $secret);
        //get extended page access token
        $url = 'https://graph.facebook.com/' . $pageId .
            '?fields=access_token' .
            '&access_token=' . $extendedUserToken .
            '&appsecret_proof=' . $appsecretProof;
        curl_setopt($ch, CURLOPT_URL, $url);
        $curlResult = curl_exec($ch);
        curl_close($ch);
        $pageToken = json_decode($curlResult)->access_token;

如何使用常规的Facebook SDK实现相同的功能？谷歌搜索并没有起到真正的作用。要么我找不到可用的东西，要么解决方案不起作用，抛出错误，比如"请求此资源需要访问令牌"或类似的东西。我已经尝试了很多，但都不起作用。

我的最后一个方法是：

        FacebookSession::setDefaultApplication($appId, $secret);
        $shortLivedSession = new FacebookSession($shortLivedToken);
        $shortLivedSession->getLongLivedSession();
        $request = new FacebookRequest($shortLivedSession, 'GET', '/' . $pageId . '?fields=access_token');
        $response = $request->execute();
        $result = $response->getGraphObject()->asArray();
        $pageToken = $result['access_token'];
        $facebookSession = new FacebookSession($pageToken);

此代码总是返回一个短暂的令牌。