very few tutorials will teach you everything you need to know about php, try getting your hands on a book called the PHP Bible, at about $75.00 it is very expensive but it is a very good book, after reading the 900 some pages you will be almost pro at PHP, there are a couple different php bibles, one is php 4 bible, and one is just php bible, i recommend getting both, and i am sure php 5 bible is coming out soon too