DevShed gets another new series kicked off in this new article - an introduction to creating PDF documents with PHP5:

In this series of articles I'll show you how to start using the "PDFlib" package to build basic PDF documents. In upcoming articles I'll cover other important characteristics, like including images into a PDF file, displaying blocks of text, and drawing basic shapes.

You'll need to be familiar with object oriented programming to understand most of this tutorial, but that's only really to get a handle on using the PDFlib library. They create some sample PDF files with it - one containing a simple string on an A4 page and another on a larger A5 page format.