Para 16.0 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:SCNOPS:PHP84/16.0/home:SCNOPS:PHP84.repo
zypper refresh
zypper install apache2-mod_php8
Para 15.6 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:SCNOPS:PHP84/15.6/home:SCNOPS:PHP84.repo
zypper refresh
zypper install apache2-mod_php8
Para 15.5 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:SCNOPS:PHP84/15.5/home:SCNOPS:PHP84.repo
zypper refresh
zypper install apache2-mod_php8