Individual skill
solid-knowledge
SOLID principles knowledge base for PHP 8.4 projects. Provides quick reference for SRP, OCP, LSP, ISP, DIP with detection patterns, PHP examples, and antipattern identification. Use for architecture audits and code quality reviews.
skills/solid-knowledge/SKILL.md
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# SOLID Principles Knowledge Base
## Overview
SOLID is a set of five design principles for writing maintainable, extensible software.
| Principle | Name | Core Idea |
|-----------|------|-----------|
| **S** | Single Responsibility | One class = one reason to change |
| **O** | Open/Closed | Open for extension, closed for modification |
| **L** | Liskov Substitution | Subtypes must be substitutable for base types |
| **I** | Interface Segregation | Many specific interfaces > one general |
| **D** | Dependency Inversion | Depend on abstractions, not concretions |
