How can I test my PHP code on my own computer?

I have a basic knowledge of coding PHP, but I don’t know how to test my pages without uploading it to the web server. I use SharePoint Designer, but I have DreamWeaver too. I need a step by step guide. Thanks.

you need to download and install a webserver on your computer, which will simulate an actual server.

Apache is a pretty common one, though I preffer Abyss. Google it.