Zend Framework (ZF) is an open source, object-oriented web application framework implemented in PHP 5 and licensed under the New BSD License. Developed by Zend
License: Open Source
Symfony is known for its flexibility and rich feature set, making it ideal for large-scale applications, while Zend Framework focuses on enterprise-level solutions with a strong emphasis on components and web services. Both frameworks offer robust support for MVC architecture and extensive community backing, but Symfony tends to have a steeper learning curve.