The Couchbase PHP SDK communicates to the cluster over Couchbase binary protocols. References present information to connect to a bucket, perform operations, and perform queries. Before installing the PHP SDK, developers need to install the C SDK available at http://docs.couchbase.com/developer/c-2.4/download-install.html
The cloud came tumbling down for many startups and sites based on the Amazon EC2 API today. There's a perception that storage and scaling in the cloud is supposed to mean we don't have to deal with outages. It's pretty clear that's not actually the case, as some popular sites like Heroku and Foursquare nosedived.