Hi,
Tell me, as of today feb 4th… what is wrong with latest Cent OS (CentOS Linux 7.7.1908), and the php installation with webmin. I looked several error records without finding anything
If you installed Virtualmin manually there are hundreds of small manual steps that has to be taken to make things work. We do not recommend doing it.
On contrariety, automatic installation is taken only about 5-10 minutes, will provide you with working out of the box system.
Just download and run the installer script.
Note: Remember, it was to be run (installer script) on clean system, without any packages being installed or altered, to work as expected.