- use arrow functions
- make anonymous functions static if possible
- add type declarations
- use first class callables

see https://www.php.net/manual/en/functions.first_class_callable_syntax.php

Resolves: #100146
Releases: main
Change-Id: Ic4f3f93b7592dc9ce3fdb2a3bd8bf2fea491ebbe
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78099


Reviewed-by: Alexander Schnitzler <git@alexanderschnitzler.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Alexander Schnitzler <git@alexanderschnitzler.de>
Tested-by: core-ci <typo3@b13.com>