PHP Application Architecture: From Chaos to Order

The book "PHP Application Architecture" is not just another syntax reference, but a deep dive into the world of designing web systems in PHP. The author, Alexey Voronov, shares years of experience in creating industrial projects, ranging from simple websites to high-load corporate portals.

This book is intended for intermediate and advanced PHP developers who are already familiar with the basics of the language but want to move to the next level: to learn to write not just working code, but correct, scalable, and easily maintainable code. The book will also be useful for team leads and architects seeking to systematize their knowledge.

The book systematically covers key aspects of architecture:

• SOLID and GRASP principles — the foundation upon which any quality system is built.
• Design Patterns (GoF) — adapted examples for PHP: Factory, Strategy, Observer, Repository, and others.
• Architectural styles: MVC, HMVC, Event-Driven, CQRS, and Event Sourcing.
• Working with databases: Data Mapper, Active Record, Unit of Work patterns, building repositories.
• Domain-Driven Design (DDD) — how to build complex business logic without turning code into "spaghetti".
• Testing and refactoring — how architecture helps write tests and safely change code.

Special attention is paid to practical examples. Each chapter contains real-life scenarios from a developer's experience: how to avoid a "god object", how to properly organize dependencies, how to separate infrastructure from business logic, and how to avoid common mistakes when working with frameworks (Laravel, Symfony, Yii).

The reader will learn:

• How to distinguish good architecture from bad.
• How to design applications that are easy to extend without rewriting.
• How to use dependency injection and containers.
• How to organize code so that it is understandable to new team members.
• How to prepare a project for load and changing requirements.

The book is written in a lively, accessible language, with humor and without excessive academicism. All code examples are relevant for PHP 8.x and modern frameworks. This is a desktop guide for those who want their PHP applications to live long and not cause headaches.