Please help us by providing the following info. Before posting please also check the pinned "Known issues" thread.
Steps to reproduce
Yum updated PHP
OC should be using the updated PHP version (7.0.9)
oC admin page reports using PHP 5.4.40
Operating system: Centos 6.8
Web server: Apache 2.2
PHP version: 7.0.9
ownCloud version (see ownCloud admin page): 9.1.0
What do I need to change to make sure that OC is using PHP 7?