Now symfony standard edition is legacy . So no need to worry much just go threw article and understand whats new in symfony 4 if standard edition is legacy now. This is the main difference in Symfony 4 from symfony 2 and symfony 3 . Older symfony versions provide by default doctrine, twig, form, validation, profiler, annotations and many other components. But some time user do not want to use it. Suppose what if user do not want to doctrine or twig? Still he has doctrine and twig in his dependency. That makes symfony heavy framework. When starting a new project developers do not like to assemble things manually. So symfony 2 and 3 provides standard edition for developers to start a big project. But was hard to scale down project and decrease dependency if user do not require some packages. Symfony 2 and 3 are big success and in years developers are now aware with composer and dependency injection. So adding/removing a new package is not a big deal. So symfony chose...

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