Designing Our Code

Good application architecture is another key factor of an application, besides the correct data model. As the application that we are going to develop in this chapter, is relatively small, this task is not very complicated. First, we will create two pages that will list books and authors. To begin with, we should think about how these pages would look. To make our simple example small and compact, we will present a header on all pages that will contain links to the books list and the authors list. Later we will add two more pages that will allow us to add an author and a book.

Of course, we should create a common include file that will define the common functions such as the header and footer display and the connection to the database. Our example is really small, so we will not be using any template system or even object-oriented syntax. (Indeed, these topics are beyond the scope of this book.) So, to summarize:

• All common functions (including code to create the PDO connection...