To alleviate having an include statement for each class used in a web application, PHP allows you
to create a function in your application named __autoload() that PHP will automatically call in order
to load class definitions as they are needed.
__autoload() takes one parameter, which is the name of the class to load, and you should define
its function body so that the class definition of the named class will be included.
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.