php - Facebook PHP OAuth2 API，无效的访问令牌

Question

即使我正确设置了 appId、appSecret、accesstoken，我也会收到错误消息“Graph returned an error: Invalid OAuth access token”。是的，令牌是在 Facebook 开发者页面中设置的。

<?php
session_start();

require_once ('data/Facebook/autoload.php');

$fb = new Facebook\Facebook([
  'app_id' => 'xxxxxxxxxxx',
  'app_secret' => 'xxxxxxxxxxxx',
  'default_graph_version' => 'v2.5'
]);

try {
  $response = $fb->get('/me','xxxxxxxxxxx');
}
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 SDK returned an error: ' . $e->getMessage();
  exit;
}

$me = $response->getGraphUser();
echo 'Logged in as ' . $me->getName();

?>