This document discusses using Phing and Hudson for continuous integration of PHP projects. Phing is a build tool similar to Ant for PHP projects that allows running tests, building packages, and more via XML configuration files. Hudson is an open source continuous integration server that can be used to run Phing build scripts and publish test reports. The document provides examples of using Phing for tasks like linting, testing, deploying, and generating documentation and packages, as well as configuring Hudson jobs to regularly run builds, track changes, and publish results.