Facebook PHP - SDK - 时间线发布不起作用

Question

我想使用Facebook的PHP SDK发布Facebook用户的时间表。 postFacebook（）方法包含发布到用户时间轴的代码。我的代码适用于Facebook登录，但Facebook发布不起作用。

将为用户填写的邮件设置自定义编辑器。来自用户的该消息将发布到用户的时间线上。我已经批准了我的Facebook应用程序，以获取访问令牌的“publish_actions”权限。

        FacebookSession::setDefaultApplication( 'xxx', 'yyy' );
        $helper = new FacebookRedirectLoginHelper( 'url' );
        if ( isset( $_SESSION ) && isset( $_SESSION['fb_token'] ) ) {
          $session = new FacebookSession( $_SESSION['fb_token'] );
          try {
            if ( !$session->validate() ) {
              $session = null;
            }
          } catch ( Exception $e ) {
            $session = null;
          }
        }  
        if ( !isset( $session ) || $session === null ) {
          try {
            $session = $helper->getSessionFromRedirect();
          } catch( FacebookRequestException $ex ) {
            print_r( $ex );
          } catch( Exception $ex ) {
            print_r( $ex );
          }
        }
        if ( isset( $session ) ) {
          $_SESSION['fb_token'] = $session->getToken();
          $session = new FacebookSession( $session->getToken() );
          $request = new FacebookRequest( $session, 'GET', '/me' );
          $response = $request->execute();
          $graphObject = $response->getGraphObject()->asArray();
          postFacebook();
          echo '<pre>' . print_r( $graphObject, 1 ) . '</pre>'; 
          echo '<a href="' . $helper->getLogoutUrl( $session, 'url' ) . '">Logout</a>'; 
        } else {
          $loginUrl = $helper->getLoginUrl(array('scope' => 'email,publish_actions'));
          header("Location: " . $loginUrl);
        }

        function postFacebook(){
            $session = new FacebookSession($_SESSION['fb_token']);
            try {

              if(isset($_SESSION['event_website'])){
                $request = new FacebookRequest(
                              $session,
                              'POST',
                              '/me/feed',
                              array (
                                'message' => $_SESSION['event_message'],
                                'link' => "http://www." . $_SESSION['event_website'] . ".xxx.com"
                              )
                            );
              } else {
                $request = new FacebookRequest(
                              $session,
                              'POST',
                              '/me/feed',
                              array (
                                'message' => $_SESSION['event_message']
                              )
                            );
              }       
            } catch(FacebookRequestException $e) {
              echo 'Graph returned an error: ' . $e->getMessage();
              exit;
            } catch(FacebookSDKException $e) {
              echo 'Facebook SDK returned an error: ' . $e->getMessage();
              exit;
            }
            $response = $request->execute();
            $graphObject = $response->getGraphObject();
          }
        ?>