What's new Features and Improvements in symfony 4.0.0?

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Update: read the Hello Symfony 4! blog post for a quick overview of the best new features of Symfony 4 and the best way to upgrade your existing applications to Symfony 4.
Symfony 4.0.0 has just been released. Here is a list of the most important changes:
  • bug #25220 [HttpFoundation] Add Session::isEmpty(), fix MockFileSessionStorage to behave like the native one (@nicolas-grekas)
  • bug #25209 [VarDumper] Dont use empty(), it chokes on eg GMP objects (@nicolas-grekas)
  • bug #25200 [HttpKernel] Arrays with scalar values passed to ESI fragment renderer throw deprecation notice (@Simperfit)
  • bug #25201 [HttpKernel] Add a better error messages when passing a private or non-tagged controller (@Simperfit)
  • bug #25155 [DependencyInjection] Detect case mismatch in autowiring (@Simperfit, @sroze)
  • bug #25217 [Dotenv] Changed preg_match flags from null to 0 (@deekthesqueak)
  • bug #25180 [DI] Fix circular reference when using setters (@nicolas-grekas)
  • bug #25204 [DI] Clear service reference graph (@nicolas-grekas)
  • bug #25203 [DI] Fix infinite loop in InlineServiceDefinitionsPass (@nicolas-grekas)
  • bug #25185 [Serializer] Do not cache attributes if attributes in context (@sroze)
  • bug #25190 [HttpKernel] Keep legacy container files for concurrent requests (@nicolas-grekas)
  • bug #25182 [HttpFoundation] AutExpireFlashBag should not clear new flashes (@Simperfit, @sroze)
  • bug #25174 [Translation] modify definitions only if the do exist (@xabbuh)
  • bug #25179 [FrameworkBundle][Serializer] Remove YamlEncoder definition if Yaml component isn't installed (@ogizanagi)
  • bug #25160 [DI] Prevent a ReflectionException during cache:clear when the parent class doesn't exist (@dunglas)
  • bug #25163 [DI] Fix tracking of env vars in exceptions (@nicolas-grekas)
  • bug #25162 [HttpKernel] Read $_ENV when checking SHELL_VERBOSITY (@nicolas-grekas)
  • bug #25158 [DI] Remove unreachable code (@GawainLynch)
  • bug #25152 [Form] Don't rely on SymfonyComponentHttpFoundationFileFile if http-foundation isn't in FileType (@issei-m)
  • bug #24987 [Console] Fix global console flag when used in chain (@Simperfit)
  • bug #25137 Adding checks for the expression language (@weaverryan)
  • bug #25151 [FrameworkBundle] Automatically enable the CSRF protection if CSRF manager exists (@sroze)
  • bug #25043 [Yaml] added ability for substitute aliases when mapping is on single line (@Michał Strzelecki, @xabbuh)
Want to upgrade to this new release? Fortunately, because Symfony protects backwards-compatibility very closely, this should be quite easy. Read our upgrade documentation to learn more.
Want to be notified whenever a new Symfony release is published? Or when a version is not maintained anymore? Or only when a security issue is fixed? Consider subscribing to the Symfony Roadmap Notifications.

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