Apache and PHP

I'm trying to run a .php file using localhost web server and i can't get it to work. I have OS X 10.6.8. I believe Apache and PHP are already installed. I have enabled File Sharing and Web Sharing under System Preferences. When I type, localhost, into my browser, I get "It works!" So I got that part working. I have placed my .php file under /myusername/Sites/file.php. So, when I type localhost/myfile.php into my browser, shouldn't I get the output of that code that I put into my .php file? Instead, I get

"Not Found The requested URL /hello.php was not found on this server."

I think I'm missing a step. Can anyone help?

Thanks

You might need to uncomment the PHP module in the Apache conf files for the web server.

Also be sure that the permissions on the PHP files are appropriate.

How would I do either of those things?

To enable PHP:

Edit the file /private/etc/apache2/httpd.conf and uncomment (remove the # at the beginning) line 111 which looks like the following: You'll need elevated privileges to do that so you might want to use something like nano or vim from the command line but open it through sudo: That will enable PHP but I just noticed a secondary problem. You're putting files in ~/Sites which means that to access it through a browser, you need to navigate to http://localhost/~<username>/hello.php (replace <username> with your user name).