dokuwiki 20180422 needs now php56 at least, I project to use php71 with nethserver-rh-php71-php-fpm…please test and report the upgrade.
yum install http://mirror.de-labrusse.fr/NethDev/nethserver-dokuwiki/dokuwiki-20180422-2.ns7.sdl.noarch.rpm http://mirror.de-labrusse.fr/NethDev/nethserver-dokuwiki/nethserver-dokuwiki-1.2.0-1.ns7.sdl.noarch.rpm