PHP and ASP

This has been asked already, but I thought I'd give a new spin on the reasons for
getting PHP and ASP to work together. My project site is primarily ASP but I want
to add on the fly PDF generation. Being a checkskate, I found the free PDF generator
that uses PHP scripts at www.fpdf.org I'm trying to get these two to work together
so I can use ASP to retrieve the data from the database, generate a chart image
and then throw it all together in a PDF via PHP

Any ideas? - apart from buy a PDF licence