yii-knowledge
Yii Knowledge Base
Quick reference for Yii3 framework patterns and PHP implementation guidelines. Yii3 is a complete rewrite — modular, PSR-compliant, and designed for modern PHP 8.4+ applications with clean architecture support.
Core Principles
PSR Compliance
Yii3 implements PSR-3 (log), PSR-4 (autoload), PSR-7/PSR-17 (HTTP messages/factories via yiisoft/http-message), PSR-11 (DI via yiisoft/di), PSR-12 (coding style), PSR-15 (middleware via yiisoft/middleware-dispatcher).
Middleware Pipeline
Request → [Router] → [Auth] → [CORS] → [Action] → Response
↓ ↓
yiisoft/router Application Logic
Rule: All HTTP handling flows through the PSR-15 middleware pipeline. No global state.
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