Merge FDF data into a PDF file using PHP

Question

Is it possible to merge FDF data with a PDF file using PHP alone? Or is there no option but to use a 3rd party command line tool to achieve this?

If that is the cas

Answer 1

by far the easiest way I have found to install pdftk on centos:

Install rpmforge repo - http://wiki.centos.org/AdditionalResources/Repositories/RPMForge#head-5aabf02717d5b6b12d47edbc5811404998926a1b

then

yum install pdftk

and thats it!