The original idea of this PR was to allow injectingstring $env into php config closures. Even though this can be done by injectingContainerConfigurator & callingenv() it seems kind of redundant when you don't need any features except the current env, eg when using the config builder classes:

- return function (AcmeConfig $config, ContainerConfigurator $c) {+ return function (AcmeConfig $config, string $env) {- if ('dev' === $c->env()) {+ if ('dev' === $env) {    // ...  }};

Injecting the$env variable looks a bit cleaner IMO.

However, while working on this PR I discovered#41182 . Even though there's already an$env variable presets in the scope of php files which can be used for the same thing, it's not really IDE friendly:

Since the original PR mentioned the that the$env variable was added for PHP <8 & Symfony 6.2 is >=8.1, it doesn't seem to be needed any more, so it can be deprecated.