I am running CentOS 7 and that is still using 5.4. I am only running a forum, IRC and some other things and I don't really want to bother with third party packages.
For what it's worth I've been using PHP 5.6 via Software Collections (SCL) on my CentOS 7 system for a few years with zero problems. I think I will update to PHP 7.x soon (probably 7.2).
https://www.softwarecollections.org/en/scls/rhscl/rh-php72/