People using PHP that want API documentation usually automatically think of phpDocumentor, which used to be the de facto standard for generating API documentation from your PHP projects. However, the project has been dormant for a long time now and definitely does not support new PHP features such as namespaces, so it was really time to look for an alternative. In this blogpost, I'll show you how I set up my Jenkins CI to use DocBlox, one of the new API documentation generators currently available.
The DocBlox project is in active development and supports additional things in top of the current feature set phpDocumentor includes. Stefan gives you the exact XML you'll need to include in your Jenkins build file (and the phpDocumentor line it will likely replace) that builds out the documentation to a given path. He's given an example of his full build file to give you some context too.