You may want to look at picking up a book at your local book store or look at grabbing one off Amazon.com. I haven't found really good PHP web resource to learn from. Usually I just do a quick google search on topics I'm trying to code.
Another option is to just dive in and start building applications. I've found that the best way to learn PHP is to learn as you go. Once you have a grasp on the basic syntax and how to move around the code, then you can pick up a book at look at OOP topics as well look into Frameworks such as Zend, CakePHP, etc.
