Tiki22, Tiki23, Tiki24 and Tiki25 require PHP 7.4 as per Requirements.
Tiki26 requires PHP 8.1
EoL of PHP 7.4 is November 2022: https://endoflife.date/php
But distros support much longer, as explained at PHP8
Polyfills now make it easier to support multiple versions of PHP with the same code.
As of 2022-01, major distros ship 7.4 (ex.: Debian 11) by default.
Related links