Design patterns – introduction, 23 GoF patterns table, when to use and when not to
Design patterns are reusable solutions to recurring design problems. The Gang of Four book from 1994 catalogued 23 patterns split into three categories. They are not code snippets to paste in – they are a vocabulary for communicating design decisions. This post is an introduction and reference table before I cover each pattern individually in the coming weeks.
- Published in Wzorce projektowe
SOLID principles in PHP – theory into code
SOLID principles are five design guidelines that make object-oriented code maintainable, extensible, and testable. They are not rules to be applied mechanically but tools for reasoning about design decisions. I show each principle in PHP with a before/after example and a concrete connection to Magento 2 architecture.
- Published in PHP
PHP 8.1 in practice – enums after a month, database storage, Money value object
PHP 8.1 was released in November 2021. After a month of migrating modules and writing new code with the new features I have a clear view of what matters in practice. Enums are the biggest quality-of-life improvement – I show how I store them in the database, use them in match expressions, and build a Money value object that shows readonly properties and enums working together.
- Published in PHP
Chain of Responsibility – validator chain, di.xml configuration with sortOrder
Chain of Responsibility passes a request along a chain of handlers. Each handler decides whether to process it or pass it on. The pattern is perfect for multi-step validation, middleware pipelines, and request processing where the set of handlers needs to change without modifying callers. I build a validator chain in PHP and show how to configure handler order through Magento 2 di.xml.
- Published in Wzorce projektowe