DDD Essentials is a bunch of contracts that allows a quick setup of a nicely layered Domain Driven Design application in PHP.
We use PHP 7 by default. I think that DDD should be considered at the start of your project so going for PHP 7 shouldn't be a problem.
Please feel free to contribute by any means.
I am actually still missing some concepts such as Sagas, so feel free to suggest your new contracts, or improve existing ones.