## Is your feature request related to a problem? Not really. It's more of a "nice to have". I'd like phpcbf to format my arrow functions from this: ```php $ids = array_map(fn($entity) => $entity->getId(), $entities); ``` to this (note the space after the `fn` keyword): ```php $ids = array_map(fn ($entity) => $entity->getId(), $entities); ``` ## Describe the solution you'd like Maybe there already is a rule for this? When I google it, I'm only able to find [this resolved issue on the PHP CS Fixer](https://github.com/PHP-CS-Fixer/PHP-CS-Fixer/issues/4750) repo. ## Additional context (optional) <!-- Add any other context or screenshots about the feature request here. --> - [x] if I would know the ins and outs of PHP_CodeSniffer, I'd certainly propose a PR. But I'm only beginning to use it...