Slim Framework

Slim framework is designed to be very lightweight, slim. It is a micro-framework that lets you to quickly create simple yet powerful web applications and APIs. It features a powerful router, template rendering with custom views, flash messages, secure cookies with AES-256 encryption, HTTP caching, logging with custom log writers, error handling and debugging, simple configuration.

If you like a framework that is very small and tight, this one is for you. It scores very well on benchmark tests, just falling behind Phalcon, but beating other major players.