For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mmanu84:php8:php85/openSUSE_Tumbleweed/home:mmanu84:php8:php85.repo
zypper refresh
zypper install apache2-mod_php8
For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mmanu84:php8:php85/openSUSE_Slowroll/home:mmanu84:php8:php85.repo
zypper refresh
zypper install apache2-mod_php8
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mmanu84:php8:php85/16.0/home:mmanu84:php8:php85.repo
zypper refresh
zypper install apache2-mod_php8