Silex

Silex is a lightweight PHP micro-framework used for building web applications and APIs. It provides developers with basic tools to manage routing (deciding what code runs for specific URLs), handle HTTP requests and responses, and organize application components efficiently. Silex is designed for simplicity and flexibility, making it easier to develop web services without the overhead of larger frameworks. Though it’s no longer actively maintained, Silex served as a foundation for many projects needing a minimal, modular approach to web development.