Check out "Learning PHP 5" by David Sklar, published by O'Rielly. Its a nice blend between introductory level stuff, and more advanced stuff like file uploading, etc. Its a nice blend between the beginner's stuff, and material you'll find useful once you've gotten a handle PHP's feel.
That said, you can also check out
http://www.devshed.net and take a peek at their PHP tutorials, many of which I have found very useful myself. Don't forget, you can learn tons of information from the documentation, so don't be afraid to dive into it and start doing some searching.