How do you know you're writing good code?

I love programming. I've been messing around with code since I was a kid and the Internet started to pick up. I've been to a couple of companies and seen some great code as well as some very "WTF" stuff. In this talk, we'll look at what makes good quality code and how you can make your code better for yourself as well as others, along with some examples of how to rewrite some basic code to make it better. We'll use PHP, but it applies to others.