If you look through the actual code on GitHub, you will notice that there is much more to it than described here. For example, some is the same but just for breweries. There is also some additional code not covered here. We recommend you look through it to become more familiar with it. Then move on to the API documentation and further examples.
Couchbase Server and the PHP SDK provids a boatload of useful methods that you can use in your day-to-day work. You should now be ready to explore thos on your own, so have fun coding with Couchbase!