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A PHP framework for web artisans
The Symfony PHP framework
Open Source PHP Framework (originally from EllisLab)
Yii 2: The Fast, Secure and Professional PHP Framework
Slim is a PHP micro framework that helps you quickly write simple yet powerful web applications and APIs.
High performance, full-stack PHP framework delivered as a C extension.
CakePHP: The Rapid Development Framework for PHP - Official Repository
The HttpFoundation component defines an object-oriented layer for the HTTP specification.