On the SitePoint PHP blog there's a new tutorial posted from Bruno Skvorc showing you how to use Nitpick CI to "nitpick" over coding standards and rules in your PHP code.
There are many ways to make sure your code respects a given code standard – we’ve covered several before. But enforcing a standard team-wide and making sure everyone knows about mistakes before they’re applied to the project isn’t something that’s very easy to do. Travis and Jenkins can both be configured to do these checks, but aren’t as easygoing about it as the solution we’re about to look at: Nitpick CI.
He starts by getting a sample project bootstrapped and pushes it up to GitHub so the Nitpick service can access it. He then switches over to the Nitpick side and shows the setup of an account and a new project pointing to the newly created repo. He then includes the process and results of two kinds of pushes: non-code (README update) and both a valid/invalid code update. He shows examples of the comments the Nitpick service makes directly on the code and a patch to fix the issues.