Google网站站长工具API

我试图提取我公司在其Google网站站长工具中注册的公司列表 . 我这样做是使用PHP和PHP的API API客户端库（https://developers.google.com/api-client-library/php/） . 我已经把一切都搞定了，除了它给了我一个空数组的事实 . 我的代码如下，任何帮助将不胜感激 .

为客户端ID，帐户等填写适当的值，并且所有内容都进行了相应的身份验证，因为我使用相同的代码来访问books API .

<?php
    /*
     * Copyright 2013 Google Inc.
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *     http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */
    session_start();
    include_once "templates/base.php";

    /************************************************
      Make an API request authenticated with a service
      account.
     ************************************************/
    require_once realpath(dirname(__FILE__) . '/../autoload.php');

    /************************************************
      ATTENTION: Fill in these values! You can get
      them by creating a new Service Account in the
      API console. Be sure to store the key file
      somewhere you can get to it - though in real
      operations you'd want to make sure it wasn't
      accessible from the webserver!
      The name is the email address value provided
      as part of the service account (not your
      address!)
      Make sure the Books API is enabled on this
      account as well, or the call will fail.
     ************************************************/
    $client_id = <Client ID>; //Client ID
    $service_account_name = <Service Account Name>; //Email Address
    $key_file_location = <Key Location>; //key.p12

    echo pageHeader("Service Account Access");
    if ($client_id == <Client ID>
        || !strlen($service_account_name)
        || !strlen($key_file_location)) {
      echo missingServiceAccountDetailsWarning();
    }

    $client = new Google_Client();
    $client->setApplicationName("Client_Library_Examples");
    $service = new Google_Service_Webmasters($client);

    /************************************************
      If we have an access token, we can carry on.
      Otherwise, we'll get one with the help of an
      assertion credential. In other examples the list
      of scopes was managed by the Client, but here
      we have to list them manually. We also supply
      the service account
     ************************************************/
    if (isset($_SESSION['service_token'])) {
      $client->setAccessToken($_SESSION['service_token']);
    }
    $key = file_get_contents($key_file_location);
    $cred = new Google_Auth_AssertionCredentials(
        $service_account_name,
        array('https://www.googleapis.com/auth/webmasters'),
        $key
    );
    $client->setAssertionCredentials($cred);
    if ($client->getAuth()->isAccessTokenExpired()) {
      $client->getAuth()->refreshTokenWithAssertion($cred);
    }
    $_SESSION['service_token'] = $client->getAccessToken();

    /************************************************
      We're just going to make the same call as in the
      simple query as an example.
     ************************************************/

    $results = $service->sites->listSites();

    $siteList = $results->siteEntry;

var_dump($siteList);

// $optParams = array('filter' => 'free-ebooks');
// $results = $service->volumes->listVolumes('Henry David Thoreau', $optParams);
// echo "<h3>Results Of Call:</h3>";
// foreach ($results as $item) {
//   echo $item['volumeInfo']['title'], "
 \n";
// }

echo pageFooter(__FILE__);