[CentOS] Recommended PHP 7 source for Centos 7

I know there's a couple third party repos offering PHP 7 for Centos. I 
prefer not to add too much third party that I don't have to and PHP 7 
has been mainstream for some time now, I thought maybe it would be in 
EPEL by now.

What is the most recommended and stable way to get an up to date PHP on 
Centos 7?