In C#, I do think thanks to ReSharper, I can define different syntax colors for class, interface and enum types (among others):
I've used this to make my source code look like this:
While it is absolutely subjective to like or dislike it, it helps me a lot to distinguish right at the very first glance whether an type is a class or an interface.
When looking through the syntax color options PHP Tools, I've found no similar setting to get an interface colored differently compared to a class.
My question
Is it possible to define separate syntax colors for classes, interfaces and enums?