This is a great site if you want to learn about PHP. If you are a visual learner this site it for you because all the tutorials are video tutorials. Its really easy to follow, and you will learn php fast. You can go to http://wildphp.com for the site or choose an individual lesson below:

Lesson 1 - Installing Tools
Lesson 2 - Using Echo
Lesson 3 - Basic Varibles
Lesson 4 - If Statements
Lesson 5 - Switch Statments
Lesson 6 - Submitting with POST
Lesson 7 - Submitting with GET

I will try to keep this list updated as more tutorials come out. Enjoy!