PHP module is not working


I had PHP 4.3.0 installed on my computer and everything was running fine when I would test my pages etc. When I tried to test a site yesterday it could not read the PHP as if there was no PHP on there at all. So I downloaded and installed the 4.3.4 version and the php.ini file looks fine and everything, but my pages still don’t load. I built the installer in UNIX as I am using OSX. Any help would be much appreciated, thank you so much!