Book Image

Mastering PHP 7

By : Branko Ajzele
Book Image

Mastering PHP 7

By: Branko Ajzele

Overview of this book

PHP is a server-side scripting language that is widely used for web development. With this book, you will get a deep understanding of the advanced programming concepts in PHP and how to apply it practically The book starts by unveiling the new features of PHP 7 and walks you through several important standards set by PHP Framework Interop Group (PHP-FIG). You’ll see, in detail, the working of all magic methods, and the importance of effective PHP OOP concepts, which will enable you to write effective PHP code. You will find out how to implement design patterns and resolve dependencies to make your code base more elegant and readable. You will also build web services alongside microservices architecture, interact with databases, and work around third-party packages to enrich applications. This book delves into the details of PHP performance optimization. You will learn about serverless architecture and the reactive programming paradigm that found its way in the PHP ecosystem. The book also explores the best ways of testing your code, debugging, tracing, profiling, and deploying your PHP application. By the end of the book, you will be able to create readable, reliable, and robust applications in PHP to meet modern day requirements in the software industry.
Table of Contents (24 chapters)
Title Page
Credits
About the Author
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface
16
Debugging, Tracing, and Profiling

Understanding dependency injection container


A dependency injection container is an object that knows how to auto-wire classes together. The auto-wire term implies both instantiating and properly configuring objects. This is by no means an easy task, which is why there are several libraries addressing this functionality.

The DependencyInjection component provided by the Symfony framework is a neat dependency injection container that can be easily installed by Composer. Moving forward, let's go ahead and create a di-container directory where we will execute these commands and set up our project:

composer require symfony/dependency-injection

The resulting output suggests we should install some additional packages:

We need to make sure we add the symfony/yaml and symfony/config packages by running the following console commands:

composer require symfony/yaml
composer require symfony/config

The symfony/yaml package installs the Symfony Yaml component. This component parses the YAML strings into PHP...