Traits to Services: Refactoring for Testability...

The Trait Problem PHP traits are seductive. You've got some chat notification logic. Four controllers need it. Slap it in a trait, use ChatNotificationTrait, done. Except now you have: Hidden dependencies — the trait calls $this-> methods that don't exist in the trait itself Invisible coupling — change the trait, break four controllers, good luck figuring out which ones Untestable logic — you can't unit test a trait in isolation because it doesn't exist in isolation Global state smell — traits e