PHP Design Patterns

Introduction

The book "PHP Design Patterns" by Aaron Saray (2019, 320 pages) is a practical guide to applying classic design patterns in the context of the PHP language. Unlike many abstract publications, this book focuses on real-world web development tasks and offers ready-made solutions that can be immediately implemented in projects. The title fully reflects the content: it is not just a retelling of GoF, but an adaptation of patterns to modern PHP realities (including versions 7.x and higher).

What the book is about

The book is divided into several logical sections. The first part introduces the basics of object-oriented design and SOLID principles, without which proper application of patterns is impossible. The author then systematically examines three main groups of patterns:

• Creational Patterns (Singleton, Factory, Abstract Factory, Builder, Prototype) — how to manage object creation, avoiding code duplication and increasing flexibility.
• Structural Patterns (Adapter, Decorator, Facade, Composite, Proxy) — how to build relationships between classes and components so that the system remains extensible.
• Behavioral Patterns (Strategy, Observer, Command, Iterator, State, Template Method) — how to organize interaction between objects and algorithms.

Each pattern is illustrated with a specific PHP example: from simple code to more complex scenarios using modern language features (typing, traits, anonymous functions). The book concludes with a discussion of testing and refactoring using patterns.

Who this book is for

The publication is aimed at mid-level PHP developers who already have experience creating web applications but want to systematize their knowledge of architecture. Beginners just learning OOP may find it challenging — confident knowledge of classes, inheritance, and interfaces is assumed. However, the book will also be useful for experienced programmers looking to refresh their knowledge or find new approaches to solving typical problems.

What the reader will learn

• How to correctly choose a pattern for a specific task, rather than applying them "just in case."
• How to combine patterns with each other (e.g., Factory + Strategy) to create flexible architecture.
• How to avoid anti-patterns and typical implementation mistakes.
• How to test code built on patterns (unit tests, mock objects).
• How to refactor "spaghetti code" using patterns without breaking existing functionality.
• How to use modern PHP features (strict typing, generators, closures) in the context of patterns.

Strengths

The main advantage of the book is its practical focus. Each pattern is accompanied not only by a class diagram but also by a full code listing that can be copied and run. The author pays attention to performance: for example, he explains why Singleton in PHP is often an anti-pattern and how to replace it. The chapter on patterns for working with databases (Active Record, Data Mapper) deserves special mention — this is rare for PHP books. The language is lively, without excessive academicism, which makes it easier to understand.

Who it is recommended for

The book will be useful for:

• PHP developers who want to move from "craft" coding to professional design.
• Team leads and architects looking for ways to standardize code within a team.
• Instructors and students of web development courses — as supplementary material for lectures.
• Anyone preparing projects for scaling and wanting to avoid typical mistakes.

If you are already familiar with patterns from other languages (Java, C++) but want to see their implementation specifically in PHP — this book will be an excellent bridge. For absolute beginners in OOP, it is better to start with more basic guides.