这将返回一个包含您可能要查找的信息的GOOGLE_SERVICE_OAUT2_Userinfoplus对象：

$oauth2 = new Google_Service_Oauth2($client);
$userInfo = $oauth2->userinfo->get();
print_r($userInfo);

其中$client是Google_Client的实例

输出：

Google_Service_Oauth2_Userinfoplus Object
(
    [internal_gapi_mappings:protected] => Array
        (
            [familyName] => family_name
            [givenName] => given_name
            [verifiedEmail] => verified_email
        )

    [email] => 
    [familyName] => 
    [gender] => 
    [givenName] => 
    [hd] => 
    [id] => 123456
    [link] => https://plus.google.com/123456
    [locale] => en-GB
    [name] => someguy
    [picture] => https://lh3.googleusercontent.com/-q1Smh9d8d0g/AAAAAAAAAAM/AAAAAAAAAAA/3YaY0XeTIPc/photo.jpg
    [verifiedEmail] => 
    [modelData:protected] => Array
        (
        )

    [processed:protected] => Array
        (
        )

)

还要注意，您还需要请求https://www.googleapis.com/auth/userinfo.profile作用域。