Just a FYI folks ... I am running OwnCloud 9.0.2 on CentOS 6.7 and php-7.0 with no issues. I installed the Webtatic repo which has several versions of PHP available for CentOS 6 and 7. I then used the official OwnCloud ce:stable repo to add the cloud software. In a leap of faith, and because this CentOS VM doesn't run anything other than OwnCloud, I used the 'php70w' PHP repo and have had no problems at all. The OwnCloud server is very lightly loaded so I have not had an opportunity to stress test it and have not tried to use MySQL (I configured it with the standard CentOS SQLite). YMMV of course, especially if you're running other PHP applications! Chuck