We now have enough information to continue exploring the language and the features PHP offers us for writing web applications. Being comfortable with these basics, especially some of the quirks, will help us understand what happens when our scripts execute. We will also see that the other features we learned aboutsuch as variable expansion and constantsare things we will use on a regular basis.
In the next chapter, we will start to investigate the reuse of code within PHP. As our scripts get larger and we want to start sharing functionality between our programs and web applications, the ability to organize code into functions and reusable code libraries will become invaluable to us.