Tecadmin published a tutorial about installing multiple PHP version with Apache on Ubuntu 20.04.
How to Install Multiple PHP Version with Apache on Ubuntu 20.04
Generally, the host manager used a separate server for each PHP version application deployment. Which increases the hosting cost. Some of the host managers are using Docker to run multiple PHP version on the single server. Also, most of you are aware of the configuration, I used in this tutorial.
How to Install Multiple PHP Version with Apache on Ubuntu 20.04