I'm running servers just for my own sites and I don't need to support clients who need down-level maintenance. Is there any reason at all for Ubuntu v22-24 or ISPConfig to have the oft-mentioned PHP 5.6 or even up through 7.4? If not using PHP5, should we manually (DB query) remove "/usr/share/php5" from sites' open_basedir lists? Any others? Support for v7 was discontinued in 11/2022. At this point I think it's a bad idea to keep it around anymore. The first release of v8 was in 11/2020. It's way beyond the time for sites to move forward - that means compelling dependency updates or looking for new dependencies/apps. Thanks.
ISPConfig only requires the PHP version that ships with the OS as default. All other PHP versions are optional and not used by ISPConfig; they are used by the websites only. No. Having an unused or non-existent directory there does not matter. if you need them depends on your websites and customers, not ISPConfig.
