Who here knows PHP? How long did it take you to learn?
 

Also, what books/tutorials or whatever do you suggest?

You never *KNOW* php. They keep coming out with new functions and stuff. Realistically, 6 months to have a grasp of whats going on, and 3-4 years before you start doing things efficiently.

sounds reasonable ... very similar process with most programming languages... it took me a comparable amount of time to realize wtf C++ is about

I've found that studying other languages and frameworks have a huge impact on programmer efficiency and it translates across all languages. I became a much better PHP programmer after studying Ruby on Rails. Also, look into the source of open source packages. They have a lot of nice ways of doing things that you can learn from.

agreed. The best way to learn a programming language is by looking at other code.

you can never know it all... a good start is php.net

I've been writing php for about 8 years now and I still learn new stuff all the time.
Sometimes it just comes to me, a better/faster way to do something... ohter stuff I see in other people's code.

Learn it as you use it, learn it as you need it, learn it as you do it.

Sounds like it's going to take me a while... Yikes.