Use a different version of php as a CGI script from PHP software Collection of Remi repository. Actually only php54, php55, php56 are available and launched one at a time, only for your Ibay.
Apache is still running the default php version, therefore Apache can not trigger php settings like you can do it with the module nethserver-phpsettings.
If you need to adjust settings to PHP, then you must adjust them in the Panel Php Settings
All php rpm must be installed directly from Remi by a yum command line.
For example if you want to display all available rpm for the software collection
yum list available php* --disablerepo=* --enablerepo=remi-phpscl
If you want to install a rpm for all php version (php54,php55,php56)
yum install php54-php-dba php55-php-dba php56-php-dba --enablerepo=remi-phpscl