can't get php in woody to work

[Antonio Rodriguez <arodriguez31@cfl.rr.com>]

Last night I made a fresh installation of a woody system for a
production system, which is mostly going to be a web server. A lot of
the work relies on php scripting. I have installed almost every module
that I could find of php4, moved to that machine some working php
scripts and programs, but from what I can see it is not working. When
trying to access http://ip.of.machine/php.script from another machine
(say, from this one running sid) firebird tries to download the
script. This is a clear sign of php not properly installed. But I
can't find the root of the problem. The main default index page
installed by debian in apache is working fine.