将facebook php sdk从v4迁移到v5时缺少方法getSession

Question

在尝试将Faceboook PHP SDk从v4迁移到v5时，我收到错误：

An uncaught Exception was encountered

Type: Error

Message: Call to undefined method Facebook\Helpers\FacebookPageTabHelper::getSession()

v5中缺少getSession()方法。

如何在v5中替换getSession（）方法？

使用v4，我必须设置APP_ID和APP_SECRET，如：

include_once('assets/facebook/autoload.php');
FacebookSession::setDefaultApplication(FACEBOOK_APP_ID, FACEBOOK_APP_SECRET);

然后我就像这样初始化FacebookPageTabHelper类：

$helper = new FacebookPageTabHelper();

然后我有了代码：

$helper = $fb->getPageTabHelper();
        if ($helper->getPageId()) {
            $data['page'] = [
                'id' => $helper->getPageId(),
                'admin' => $helper->isAdmin(),
                'liked' => false
            ];
        }

/* IF PAGE SESSION AUTO LOGIN USER */
        if ($helper->getSession()) {
            $session = $helper->getSession();
        }

在v5中，我这样做：

require_once('assets/facebook/facebook-php-sdk-v-5/autoload.php');
    $fb = new Facebook\Facebook(
            [
        'app_id' => FACEBOOK_APP_ID,
        'app_secret' => FACEBOOK_APP_SECRET,
        'default_graph_version' => 'v2.8',
            ]
    );

$helper = $fb->getPageTabHelper();
        if ($helper->getPageId()) {
            $data['page'] = [
                'id' => $helper->getPageId(),
                'admin' => $helper->isAdmin(),
                'liked' => false
            ];
        }

* IF PAGE SESSION AUTO LOGIN USER */
        if ($helper->getSession()) {
            $session = $helper->getSession();
        }