hmmm...here is how to go about it:
1. Download and install WAMP server from
http://www.wampserver.com/en. It shall install Apache, PHP and MySQL. Start the wamp server.
2. Once installed, lets say to D:\wamp, then there is a `www` directory at D:\wamp\www.
Place you PHP script(.php file) in this `www` directory.
3. Lets assume the name of that PHP script is `info.php`. Start your browser and type `http://127.0.0.1/info.php` in the address bar. You should see a large table containing your PHP installation information.
Let me know if you need more help getting started!