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A series of posts showcasing the new features introduced by each Symfony version.

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Symfony 4.0 and 3.4 have the same new features because both were released at the same time. Learn more about the Symfony release process.

Symfony 3.4 implements PHP's SessionUpdateTimestampHandlerInterface to prevent session fixation issues and provide lazy-write in session handlers.
October 27, 2017 #Living on the edge
Symfony 3.4 includes a new debug:autowiring command so you can quickly know which type-hints must be used to inject the services.
October 26, 2017 #Living on the edge
In Symfony 3.4 you can disable global form themes for specific forms thanks to the new "only" keyword added to the "form_theme" Twig tag.
October 18, 2017 #Living on the edge
In Symfony 3.4, Guard authenticators can implement a new method called supports() to better separate the responsibilities of the getCredentials() method.
October 17, 2017 #Living on the edge
Symfony 3.4 adds a new command called debug:form to introspect all the information available for form types and their options.
October 16, 2017 #Living on the edge
Symfony 3.4 allows binding services and parameters in local configuration files to avoid duplicating them in multiple service definitions.
October 13, 2017 #Living on the edge
In Symfony 3.4 services and aliases are private by default. This may require you to change some service definitions in your bundles and applications.
October 11, 2017 #Living on the edge
Symfony 3.4 adds a minimalist PSR-3 logger so you can display, aggregate and store log messages without having to install Monolog.
October 10, 2017 #Living on the edge
In Symfony 3.4, there's a new directory to override third-party templates and a new feature to avoid circular exceptions when overriding and extending templates at the same time.
October 9, 2017 #Living on the edge
Symfony 3.4 provides a simpler way to inject all services tagged with a specific tag, so you don't have to create a compiler pass just to do that.
October 6, 2017 #Living on the edge