Don't click on the source code link until you're ready for it. That's an answer to the "assignment" in the beginner tutorial. The good stuff is under the beginner tutorial link.
Now for the explanation: This is a PHP tutorial for people new to PHP, but not to programming in general. This tutorial also assumes you are familiar with XHTML and the way it is rendered by a browser. Hopefully, if that describes you, you'll find it useful. The beginner tutorial link is the actual lesson, and the source code link is a solution to the practice "assignment" described in the lesson.