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我正在尝试使用像这样的php sdk获取Facebook用户ID

$fb = new Facebook\Facebook([
    'app_id' => '11111111111',
    'app_secret' => '1111222211111112222',
    'default_graph_version' => 'v2.4',
]);

$helper = $fb->getRedirectLoginHelper();


$permissions = ['public_profile','email']; // Optional permissions
$loginUrl = $helper->getLoginUrl('http://MyWebSite', $permissions);

echo '<a href="' . $loginUrl . '">Log in with Facebook!</a>';


    try {
        $accessToken = $helper->getAccessToken();
        var_dump($accessToken);
    } catch (Facebook\Exceptions\FacebookResponseException $e) {
        // When Graph returns an error
        echo 'Graph returned an error: ' . $e->getMessage();
        exit;
    } catch (Facebook\Exceptions\FacebookSDKException $e) {
        // When validation fails or other local issues
        echo 'Facebook …