Change Details

We already took a look at [PHPArch](https://github.com/j6s/phparch) which looked promising but is sadly no longer maintained. [PHPat](https://github.com/carlosas/phpat) was named its successor, so let's try it out!

We chose to try out [PHPat](https://github.com/carlosas/phpat) for enforcing the dependency rules within the Wikibase REST API namespaces. This was partially done in this patch: https://gerrit.wikimedia.org/r/865577 Checks for the following namespaces/layers are still missing: [ ] Serialization [ ] Validation [ ] Presentation

We already took a look at [PHPArch](https://github.com/j6s/phparch) which looked promising but is sadly no longer maintained. [PHPat](https://github.com/carlosas/phpat) was named its successor, so let's try it out!chose to try out [PHPat](https://github.com/carlosas/phpat) for enforcing the dependency rules within the Wikibase REST API namespaces. This was partially done in this patch: https://gerrit.wikimedia.org/r/865577 Checks for the following namespaces/layers are still missing: [ ] Serialization [ ] Validation [ ] Presentation