I wouldn't touch this question of yours with a infinite-length stick.
Let's say that that stick of mine broke, and that I know what you are talking about, then hypothetically this is what you would have heard:
To run PHP code you need to have access to computer that has 1) some form of server software installed (like Apache or MS IIS (or whatever it's called), 2) and PHP.
Search for install PHP, and/or Apache. Try this forum, you are bound to find something of interest...
You could also try to sign up with a web server that supports PHP, all you need to do then is to upload your files to your web space and run you code.