The document provides a history and overview of the Symfony framework. It describes the initial release of Symfony 1.0 in 2007 and key updates through 1.4 in 2009. It then introduces Symfony 2 as a next generation version with a new low-level architecture built for PHP 5.3. The document provides examples of how configuration, routing, and controllers work in Symfony 2 through PHP code snippets and
