You can edit and run the PHP version of all your existing domains as you wish with the command below.
virtualmin modify-web --all-domains --php-version 5.6
When I typed the above command, the PHP version of all domains changed to 5.6.
You can customize the PHP version of your specific domains and run the command below.
virtualmin modify-web --domain example.com --php-version 7.1.5
With the above command, the php version of example.com changed to 7.1.5.
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