For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:jetchisel/openSUSE_Tumbleweed/home:jetchisel.repo
zypper refresh
zypper install phpvirtualbox
For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:jetchisel/openSUSE_Factory/home:jetchisel.repo
zypper refresh
zypper install phpvirtualbox
For SLE 15 SP1 Backports run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:jetchisel/SLE_15_SP1_Backports/home:jetchisel.repo
zypper refresh
zypper install phpvirtualbox
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:jetchisel/15.4/home:jetchisel.repo
zypper refresh
zypper install phpvirtualbox