Implementing Oauth2 login, Fatal error: Class 'Google_Service' not found

Question

I am updating my website\'s login system from LightOpenID to Google\'s Oauth 2.0.

When I require the Client.php and the Service/Oauth2.php I get an error

Answer 1

The new way of doing this (circa early 2016) is

require_once("Google/autoload.php");

(Assuming you have already set your include path to have /path/to/google-api-php-client/src)