Symfony provides an architecture, components and tools for developers to build complex web applications faster. Choosing symfony allows you to release your applications earlier, host and scale them without problem, and maintain them over time with no surprise.
Symfony is based on experience. It does not reinvent the wheel: it uses most of the best practices of web development and integrates some great third-party libraries.
Thousands of developers already trust symfony for their applications!
New users join the community every day, and that makes of symfony the most popular PHP framework around. A large community means easy-to-find support, user-contributed documentation, plugins, and free applications.
Symfony Official website - http://www.symfony-project.org/