We want to make sure that all our dependencies point in the right direction (e.g. `Domain` must not depend on anything, `DataAccess` may depend on ORM classes and Domain interfaces, etc) and that our architecture is sound.
There are some candidates for dependency analysis:
* https://github.com/mihaeu/dephpend (has pull requests for PHP 8.x compatibility, but is not compatible yet (last checked July 2023 ))
* https://github.com/qossmic/deptrac
* https://github.com/carlosas/phpat
The following candidates are unsuitable:
* https://github.com/j6s/phparch (Abandoned, recommends phpat)
* https://github.com/mamuz/PhpDependencyAnalysis (not compatible with PHP 8.x, last commit was 2019)
The decision on which library to use should be based on the following criteria:
1. Does it allow to describe our restrictions? We want to check for test dependencies
2. How readable and expressive is this description?
3. How fast is the analysis?