I'm trying to setup Eclipse for PHP development on my Windowx box. I've got PDT, Apache and PHP installed and was using this guide as a reference. Everything works fine except when I preview the sample web page I see the entire plain text file instead of the expected PHP generated code. For example, the file I have contains the following:
<?php
echo "Hello World!";
?>
When I run it, I expect to see
Hello World!
But instead I see the entire file as plain text as shown in the below screen cap

I'm not sure if there's something wrong with the syntax or configuration. I'd also like to be able to debug PHP web apps through Eclipse. If there are better alternatives to setting up PHP development with debugging, I'm open to suggestions. Thanks in advance.
UPDATE:
@Neal - The Apache server is running. I know when I was installing PHP, I never got the prompt to add it to my Apache server instance as the tutorial indicated. If that's the case, then no. Is there a way I can add PHP to the Apache server manually? Thanks.
@ontaria_ - I'll try reinstalling PHP using the zip file, I was using the MSI installer instead and according the the readme it should've configured itself for Apache automatically.
UPDATE 2:
Thanks all for your help. I had another look and it turns out I was using the Non-thread safe installer, I downloaded and ran the Thread Safe installer and saw the option to include the modules for Apache. Tested and worked as expected, thanks again for your help.