如何通过API(Php SDK)以管理员身份发布到Facebook页面？

require_once 'Facebook/autoload.php';

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

$helper = $fb->getRedirectLoginHelper();

$permissions = ['manage_pages', 'publish_pages']; // 需要的权限

$loginUrl = $helper->getLoginUrl('YOUR_REDIRECT_URL', $permissions);

// 用户登录并授权后，会重定向到YOUR_REDIRECT_URL，并携带访问令牌参数

// 在YOUR_REDIRECT_URL页面中，获取访问令牌
$accessToken = $helper->getAccessToken();

try {
  $response = $fb->post('/{page-id}/feed', [
    'message' => 'Hello, Facebook Page!',
  ], $accessToken);
  
  $graphNode = $response->getGraphNode();
  
  echo 'Post ID: ' . $graphNode['id'];
} 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();
}