Newbie question: can't get PHP working

[leef12 <leef12 az rmci net>]

I'm new to PHP and I'm not having any success getting PHP running from 
the stock Redhat 7.3 CDs.  I've installed PHP 4.1.2 and Apache 1.3.23 
from rpms.   Apache seems to be
working okay because I can see the test page at  http://localhost .

When I attempt to run the following script phptest.php in the browser: 
<? phpinfo() ?>
the script doesn't run and all I see is the contents of the file:     <? 
phpinfo() ?>

I've gone through httpd.conf several times and have added the following 
lines explicitly as suggested in previous posts:

AddModule mod_php4.c
AddType application/x-httpd-php .php4 .php3 .phtml .php
AddType application/x-httpd-php-source .phps

I've also tried compiling php from the source obtained from PHP.NET
The source compiles just fine but PHP still doesn't run.  If I run the 
following from the command line  "/usr/bin/php phptest.php" and save the 
output to a file, the browser displays the contents of the output file 
correctly.  

Is there some additional configuration that I need to do but don't know 
about?

Thanks, Fourmun