<?php
require_once __DIR__ . '/vendor/autoload.php'; // 引入Facebook SDK

$fb = new Facebook\Facebook([
  'app_id' => '{app-id}',
  'app_secret' => '{app-secret}',
  'default_graph_version' => 'v12.0',
]);

$helper = $fb->getRedirectLoginHelper();

// 请求扩展权限
$permissions = ['email', 'user_likes', 'user_posts']; 
$loginUrl = $helper->getLoginUrl('https://your-callback-url.com/login-callback.php', $permissions);

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

// 回调处理
try {
  $accessToken = $helper->getAccessToken();
  $response = $fb->get('/me?fields=id,name,email,likes{name}', $accessToken);
  $userNode = $response->getGraphUser();
  
  // 使用获取的数据
  echo 'Logged in as: ' . $userNode->getName();
  echo 'Email: ' . $userNode->getEmail();
  
  // 获取点赞数据
  $likes = $userNode->getField('likes');
  foreach ($likes as $like) {
    echo $like['name'] . '<br>';
  }
  
} catch(Facebook\Exceptions\FacebookResponseException $e) {
  echo 'Graph returned an error: ' . $e->getMessage();
} catch(Facebook\Exceptions\FacebookSDKException $e) {
  echo 'Facebook SDK returned an error: ' . $e->getMessage();
}
?>

// 交换长期令牌示例
$oAuth2Client = $fb->getOAuth2Client();
$longLivedAccessToken = $oAuth2Client->getLongLivedAccessToken($accessToken);