Google API PHP Client 介绍
Google API PHP Client 库能让你在 Google+、Drive、或者你服务器上的 YouTube 上使用 Google API。
示例代码：
<?php
require_once 'google-api-php-client/src/Google/autoload.php'; // or wherever autoload.php is located
$client = new Google_Client();
$client->setApplicationName("Client_Library_Examples");
$client->setDeveloperKey("YOUR_APP_KEY");
$service = new Google_Service_Books($client);
$optParams = array('filter' => 'free-ebooks');
$results = $service->volumes->listVolumes('Henry David Thoreau', $optParams);
foreach ($results as $item) {
echo $item['volumeInfo']['title'], "<br /> \n";
}