Symfony
Symfony is a high-performance PHP web application framework and a set of reusable PHP components. It follows the Model-View-Controller (MVC) architectural pattern and provides tools and libraries to accelerate the development of complex web applications. The framework emphasizes modularity, flexibility, and best practices such as dependency injection and event-driven programming.
Developers should learn Symfony when building enterprise-level web applications, APIs, or microservices in PHP that require scalability, maintainability, and robust security features. It is ideal for projects where code reusability, testing, and adherence to standards like PSR are critical, such as e-commerce platforms, content management systems, and large-scale business applications.