Why do PHP training courses cost so much, and programming courses in general. Most of what I see on these places I already know, so why are they charging like $400/day? What is required to teach these things do you think.

$400/day? Sounds like hypnosis sessions to quit smoking!
Please clarify... you want to know how to become a programming teacher or where to learn without paying that fees?

Well I've looked at a few websites and the training costs is about that price anywhere, except zend is $800 /course not per day. I'd like to gain huge knowledge in php, and perhaps even be able to teach it. I already know PHP, I just want to learn a lot more.

Subscribe tp PHP Architect. There are some pretty advanced articles in the magazine.

I already know PHP, I just want to learn a lot more.

Join some PHP forums and answer users' questions. Best way to hone your PHP skills and also get some teaching experience.