How to switch to PSR4 in your composer.json?

composer require symplify/psr4-switcher --dev

Does short file name matches the class name?

vendor/bin/psr4-switcher check-file-class-name src

What files have 2 and more classes?

vendor/bin/psr4-switcher find-multi-classes tests

In case you are experiencing a bug or want to request a new feature head over to the Symplify monorepo issue tracker

The sources of this package are contained in the Symplify monorepo. We welcome contributions for this package on symplify/symplify.