You may not really need the FDF toolkit, unless you need to do something
pretty sophisticated. There's code samples in the user notes at
http://php.net/fdf that'll let you parse and generate FDF streams
without having any third-party libraries installed...and it's working
pretty well for me here.
Well, the basic language syntax hasn't changed. The major hang-ups I'd
expect would be:
(1) If you're using the $_POST, $_GET, $_SERVER, etc. variables, they
didn't exist in that form back then -- you'd need to replace them with,
for example, $HTTP_POST_VARS, and
(2) You would, of course, want