Refactor Legacy PHP with Confidence
Master Proven Techniques for Cleaner Code
This practical cheat sheet helps you turn complex, hard-to-maintain PHP code into clean, testable, and modular architecture. You’ll learn when and how to apply proven refactoring techniques so you can reduce bugs, improve readability, and refactor legacy systems with confidence — using real-world before-and-after examples.
Table of Contents
- Core Refactoring Techniques in PHP
Extract Function, Extract Class, Inline Function, Move Method - Object-Oriented Refactoring Patterns
EReplace Conditional with Polymorphism, Replace Array with Object, Introduce Parameter Object - Improving Code Readability & Maintainability
Eliminate Duplication, Encapsulate Field, Rename Variables & Methods, Simplify Boolean Expressions - Clean Control Flow in PHP
Guard Clauses (Early Returns), Replace Magic Numbers with Constants, Split Temporary Variables - Dependency Injection & Testable PHP Design
Decoupling services, introducing interfaces, writing integration tests with PHPUnit - Refactoring Legacy PHP: End-to-End Practical Example
Step-by-step transformation of a monolithic order processor into clean architecture
