(Zend Gdataライブラリをダウンロードし、Zendフォルダを展開しておく。)
require_once 'Zend/Loader.php';
Zend_Loader::loadClass('Zend_Gdata_Docs');
Zend_Loader::loadClass('Zend_Gdata_ClientLogin');
$service = Zend_Gdata_Docs::AUTH_SERVICE_NAME;
$user = "ユーザーID";
$pass = "パスワード";
$client = Zend_Gdata_ClientLogin::getHttpClient($user, $pass, $service);
$docs = new Zend_Gdata_Docs($client);
$feed = $docs->getDocumentListFeed();
foreach($feed->entries as $folder){
//最終更新日とドキュメント名を出力
print date("Y/m/d H:i:s", strtotime($folder->updated->text))." - ".$folder->title->text."<br>";
}