如何检查用户是否使用新的facebook php api登录

composer require facebook/graph-sdk

require_once 'vendor/autoload.php';

$app_id = 'your_app_id';
$app_secret = 'your_app_secret';

$client = new Facebook\Facebook([
  'app_id' => $app_id,
  'app_secret' => $app_secret,
  'default_graph_version' => 'v12.0',
]);

try {
  $response = $client->get('/me');
} catch(Facebook\Exceptions\FacebookResponseException $e) {
  echo 'Graph returned an error: ' . $e->getMessage();
  exit;
} catch(Facebook\Exceptions\FacebookSDKException $e) {
  echo 'Facebook SDK returned an error: ' . $e->getMessage();
  exit;
}

$user = $response->getGraphUser();

if($user) {
  echo 'User is logged in and has granted access to the app.';
} else {
  echo 'User is not logged in or has not granted access to the app.';
}