Updating the Symfony Demo application to Symfony 4

The Symfony Demo application is a reference application created to show how to develop Symfony applications following the recommended best practices. It's mainly used as a learning and teaching resource, so we keep it in sync with the latest Symfony versions and features.

During the past weeks we've worked hard to be ready for the Symfony 4 release and we've fully updated the application to Symfony 4 and Symfony Flex. The main changes introduced in the app are:

• Updated code to use as many PHP 7.1 features as possible;
• Used the flat and simple dir structure proposed by Symfony 4;
• Removed most of the service config thanks to the autowiring, _defaults, autoconfiguration and local binding;
• Created services for Doctrine repositories;
• Revamped the data fixtures to use modern DoctrineFixturesBundle practices;
• and all the other great simplifications allowed by Symfony 4!

Run this command to install the new Symfony Demo version:

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$ composer create-project symfony/symfony-demo