Zend Core for i5/OS provides the i5 Toolkit for PHP, an API system to call i5 functionalities from PHP. One of the function of this API is the i5_spool that is able to manage spool files for specific i5 users. In this post I present a class to convert a spool file in PDF using the Zend_Pdf class of the Zend Framework.
He includes the quick twelve line code you'll need to get the job done. It reads in the spool file with some built-in functions and calls the "toPdf" method to export the result. There's also a few parameters you can include as a second parameter that let you define things like font size and margins.