Book Image

Modular Programming with PHP 7

By : Branko Ajzele
Book Image

Modular Programming with PHP 7

By: Branko Ajzele

Overview of this book

Modular design techniques help you build readable, manageable, reusable, and more efficient codes. PHP 7, which is a popular open source scripting language, is used to build modular functions for your software. With this book, you will gain a deep insight into the modular programming paradigm and how to achieve modularity in your PHP code. We start with a brief introduction to the new features of PHP 7, some of which open a door to new concepts used in modular development. With design patterns being at the heart of all modular PHP code, you will learn about the GoF design patterns and how to apply them. You will see how to write code that is easy to maintain and extend over time with the help of the SOLID design principles. Throughout the rest of the book, you will build different working modules of a modern web shop application using the Symfony framework, which will give you a deep understanding of modular application development using PHP 7.
Table of Contents (19 chapters)
Modular Programming with PHP 7
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Free Chapter
1
Ecosystem Overview
Index

Requirements


Application requirements, defined under Chapter 4, Requirement Specification for Modular Web Shop App, do not give us any specifics as to what type of shipment we need to implement. Thus, for the purpose of this chapter, we will develop two shipment methods: dynamic rate shipment and flat rate shipment. Dynamic rate shipment is used as a way of connecting the shipment method to a real shipment processor, such as UPS, FedEx, and so on. It will not, however, actually connect to any of the external APIs.

Ideally, we want this done by an interface similar to the following:

namespace Foggyline\SalesBundle\Interface;

interface Shipment
{
  function getInfo($street, $city, $country, $postcode, $amount, $qty);
  function process($street, $city, $country, $postcode, $amount, $qty);
}

The getInfo method can then be used to fetch the available delivery options for the given order information, while the process method would then process the selected delivery option. For example, we might...