You will need to dl php @ php.net (if you dont have it)
Redhat installs the damn thing in some odd location as far as I can remember for the config files all over the place... I just get Apache and PHP by myself and start from scratch.
Compile it and add entries to your httpd.conf file.
Just read the README or INSTALL files in the php distribution...it is really simple...trust me
Dont build it as a static module though..that gets messy...use the dynamic module.
Also take note of the differences when using Apache ver 2.xx there are subtle differences, but it is all in the INSTALL file.
If you cant come right, the other option is to get the NuSphere package that installs it all (PHP, Apache, Perl and MySQL) for you
Another Option is to look on hotscripts.com....browse under PHP I think I saw some tools there to do the config for you - however I suggest doing it manually - you learn that way
Lots of info at phpbuilder.net also...
If you still dont come right...PM me.
You never know maybe its working already though....
start apache (apachectl start)
make a small file in your htdocs directory test.php with the line
<?phpinfo()?>
save and open in a browser...if shows a page...there you go