Google+ PHP Quickstart - PHP DATA
Modified version of the PHP Quickstart from Google. Brings data into PHP which can be used for authentication, user profiles etc.
Follow Steps 1 & 2 from the original documentation as follows:
The instructions for getting started are available at: https://developers.google.com/+/quickstart/php
Browse to your quick-start app, loading index.php from the URL where you hosted it.