what program do you run php script in?

PHP

But to answer your question more effectively, through a PHP-enabled web server like apache.

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evil, corruption and bad taste!

Unless you don't want to set up an apache web server. There are smaller more suitable softwares for windows that will help you to test run smaller php scripts.

But if you want total control and efficiency, cense's answer is the way to go.

ty mate

Er, I feel stupid. Is it a program you have to download or where do you compile it?

You can just upload .php files to your host with the code inside them. I'm using freehostia and that works fine for me. If you want to embedd php into html pages you can use the <? php ?> tag. On my host, that requires a special .htaccess entry.

http://www.php.net/

PHP can run standalone but it's focus is for the web, and thus it runs as a module or addition to webservers such as apache in most implementations.

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evil, corruption and bad taste!

Install PHP. Open command prompt. Type:

$php script.php

You either upload it to a server which supports php. Or, for testing use something like this: http://www.easyphp.org/telechargements.php3

†Jesus†