What is Symfony
Symfony is an open-source PHP web application framework.
To this end, it proposes modular functionalities and adaptations that can facilitate and accelerate the development of complex web applications. The other advantages of Symfony are the following: greater flexibility, ease of use, a high level of customisation, easy testing and debugging. Additionally, it has a large online support community.
Finally, it is sponsored by SensioLabs, ensuring its development and longevity.