Worth checking these guys out for CI. Using this alongside Behat. Done some research and so far all seems rather awesome!
Instead of PHPCI, I would recommend TravisCI. This is tool is great for PHP continuous integration because it is easy to use with your projects. Travis doesn't require you to install it. It is an online tool where you can login, connect your github repo and get started. Your github repo should be connected to your server and it must have travis.yaml file.