使用googleapi客户端php刷新令牌

我对谷歌api的痛苦还在继续。。。

我可以使用脚本来使用刷新令牌——自动刷新并保持我对日历的访问。我可以和日历互动，一切都很好。

我现在想继续使用google api客户端for php，我昨天在我的令牌有效时就已经完成了这项工作，但现在它已经过期了，我不知道如何使用刷新令牌来获得新令牌，并在未来过期后继续进行身份验证。

我已经找到了很多参考文献并尝试了这些——这是我迄今为止基于simple.php示例的测试脚本：

<?php
require_once '../../src/Google_Client.php';
require_once '../../src/contrib/Google_CalendarService.php';
session_start();
$client = new Google_Client();
$client->setAccessType('offline');
$client->setApplicationName("Downs Golfmanager");

// Visit https://code.google.com/apis/console?api=calendar to generate your
// client id, client secret, and to register your redirect uri.
$client->setClientId('XXXXXX.apps.googleusercontent.com');
$client->setClientSecret('XXXXXX');
$client->setRedirectUri('XXXXXX');
$client->setDeveloperKey('XXXXXX');
$client->refreshToken('X/XXXXX');

$client->setUseObjects(true);
$cal = new Google_CalendarService($client);
if (isset($_GET['logout'])) {
  unset($_SESSION['token']);
}
if (isset($_GET['code'])) {
  $client->authenticate($_GET['code']);
  $_SESSION['token'] = $client->getAccessToken();
  header('Location: http://' . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF']);
}
if (isset($_SESSION['token'])) {
  $client->setAccessToken($_SESSION['token']);
}
if($client->isAccessTokenExpired()) {
    /
    echo 'Access Token Expired'; // Debug
    //$client->refreshToken($refreshToken);
}
if ($client->getAccessToken()) {
    $event = new Google_Event();
    $event->setSummary('Appointment');
    $event->setLocation('Somewhere');
    $start = new Google_EventDateTime();
    $start->setDateTime('2013-08-28T14:00:00.000+01:00');
    $event->setStart($start);
    $end = new Google_EventDateTime();
    $end->setDateTime('2013-08-28T15:25:00.000+01:00');
    $event->setEnd($end);
    $createdEvent = $cal->events->insert('XXXXXX@group.calendar.google.com', $event);
    //echo "<pre>" . print_r($createdEvent, true) . "</pre>";
    echo $createdEvent->getId();

    //test pulling events
    $events = $cal->events->listEvents('XXXXXX@group.calendar.google.com');
    while(true) {
      foreach ($events->getItems() as $event) {
        echo $event->getSummary();
      }
      $pageToken = $events->getNextPageToken();
      if ($pageToken) {
        $optParams = array(
            'pageToken' => $pageToken,
            'timeMin'=>'2013-08-26T00:00:00+01:00',
            'timeMax'=>'2013-08-31T00:00:00+01:00'
            );
        $events = $cal->events->listEvents('XXXXXX@group.calendar.google.com', $optParams);
      } else {
        break;
      }
    }
    //print "<h1>Events List</h1><pre>" . print_r($events, true) . "</pre>";

  $calList = $cal->calendarList->listCalendarList();
  print "<h1>Calendar List</h1><pre>" . print_r($calList, true) . "</pre>";

$_SESSION['token'] = $client->getAccessToken();
} else {
  $authUrl = $client->createAuthUrl();
  print "<a class='login' href='$authUrl'>Connect Me!</a>";
}

和我以前的帖子一样，我不清楚这里应该发生什么。我的令牌已过期-我有刷新令牌。每次访问时，我需要对代码进行哪些更改才能自动刷新授权。

编辑：错误代码为：The OAuth 2.0 access token has expired, and a refresh token is not available

我已经评论了几行额外的行，我在尝试解决这些行时只是为了避免混淆进一步的

感谢