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New in Symfony 3.3: A simpler way to get the project root directory
Symfony 3.3 defines a new Kernel::getProjectDir() to replace Kernel::getRootDir() as the way to find the root project directory.
New in Symfony 3.3: Improved flash messages
In Symfony 3.3, it's easier to work with flash messages in templates. In addition, the session no longer starts automatically when checking if there are flash messages.
New in Symfony 3.3: Workflow improvements
In Symfony 3.3, the Workflow component will include lots of useful new features.
New in Symfony 3.3: Deprecated the special SYMFONY__ environment variables
In Symfony 3.3, the special SYMFONY__ environment variables have been deprecated and they will no longer work on Symfony 4.0. Use regular environment variables instead.
New in Symfony 3.3: "about" command
Symfony 3.3 adds a new command called "about" to display useful information about your Symfony application and your PHP environment.
New in Symfony 3.3: Manifest-based asset versioning
Symfony 3.3 adds a new versioning strategy based on JSON file manifests, which is used by popular tools such as Webpack.
New in Symfony 3.3: Better handling of command exceptions
Symfony 3.3 deprecates the ConsoleEvents::EXCEPTION event in favor of a new ConsoleEvents::ERROR event that is able to handle also the exceptions thrown from listeners.
New in Symfony 3.3: Lock component
Symfony 3.3 adds a new Lock component that supports different stores (flock, semaphore, Redis, Memcache), auto-expiring locks and combining multiple lock stores.
New in Symfony 3.3: Load config files with glob patterns
Symfony 3.3 adds full support for loading config files using glob patterns, both for the container and the routing file loaders.
New in Symfony 3.3: Deprecated cache clear with warmup
Symfony 3.3 deprecates the warmup part of the cache:clear because it does not work well and it doesn't guarantee that the generated cache is exactly the same as the one that would have been generated via cache:warmup.