CakePHP has a broad set of libraries that include one of the most thorough arrays of helpful components. It’s a great option if you need to implement hard-to-find features.

The Fuel PHP Framework is a fast, simple and flexible PHP 5.4 framework, born from the best ideas of other frameworks, with a fresh start!

Symfony is a set of PHP Components, a Web Application framework, a Philosophy, and a Community — all working together in harmony.

The Laminas Project is an open-source continuation of Zend Framework, a PHP framework and component library targeting enterprise applications.

Slim is a PHP micro framework that helps you quickly write simple yet powerful web applications and APIs.

Yii is a fast, secure, and efficient PHP framework.Flexible yet pragmatic.Works right out of the box.Has reasonable defaults.

Laravel is a web application framework with expressive, elegant syntax. We’ve already laid the foundation — freeing you to create without sweating the small things.

Fat-Free Framework, or F3, is a straightforward PHP framework. Its codebase is only 65 KB, and the framework is modular, allowing you to only use the necessary code.

Phalcon is a full-stack PHP framework whose source code is written in the C programming language. Using the framework doesn’t require knowledge of C as it uses PHP classes and its namespaces.

PHPixie is easy to learn and does not rely on automagic. You will always be in charge of what's happening.