Download the PHP manual in the one-file CHM help file here: http://www.php.net/download-docs.php ... and refer to it always and often. If you want to get a grip on PHP, this is your best friend now and long into the future. Don't forget to read the many helpful comments in the online manual when you're trying to understand a particular function.

I have come to where I am now with PHP by reading a couple of random tutorials a very long time ago, and then going forth with my experiments. I personally see more dig DevShed for a forum with helpful and knowledgeable people, but just pick the arena where you fit in, and learn with the professionals. (And help others where you can.)

The main thing you need to wrap your head around is the general logic of programming; before you code, think through what you intend to accomplish, and think through the aspects and routines of your code that will handle it. Don't become a copy-paste coder, try to understand why and how things are done, so you can adapt and improvise.