A PHP web framework is a collection of classes, which helps to develop a web application. Symfony is an open-source MVC framework for rapidly developing modern web applications. Symfony is a full-stack web framework. It contains a set of reusable PHP components. You can use any Symfony components in applications, independently from the framework.
Symfony has a huge amount of functionality and active community. It has a flexible configuration using YAML, XML, or annotations. Symfony integrates with an independent library and PHP Unit. Symfony is mainly inspired by Ruby on Rails, Django, and Spring web application frameworks. Symfony components are being used by a lot of open source projects that include Composer, Drupal, and php.
The Symfony framework consists of several components, such as the HttpFoundation component that understands HTTP and offers a nice request and response object used by the other components. Others are merely helper components, such as the Validator, that helps to validate data. Kernel component is the heart of the system. Kernel is basically the ‘main class’ that manages the environment and has the responsibility of handling a http request.
Symfony’s well-organized structure, clean code, and good programming practices make web development easier. Symfony is very flexible, used to build micro-sites and handle enterprise applications with billions of connections.