This documentation page does not mention that "zabbix-apache-conf-scl" package also must be installed.
It should be mentioned in two sections - installation and upgrade from older versions.

Without this package 5.0 frontend is unconfigured!

Without the info Zabbix users may suppose that they need to copy/rename /etc/httpd/conf.d/zabbix.conf.rpmsave file from older packages, which still use PHP5.4 as module to Apache, which fails on frontend 5.0 of course.

https://www.zabbix.com/documentation/5.0/manual/installation/frontend/frontend_on_rhel7