Yes there are ways to run php code on your knoppix Desktop PC.
Here are a few links which discuss this topic.
http://www.knoppix.net/forum/viewtop...105&highlight=

http://www.knoppix.net/forum/viewtop...851&highlight=

http://www.knoppix.net/forum/viewtop...303&highlight=

http://www.knoppix.net/forum/viewtop...375&highlight=