Hi, Help Please PHP version 7.2 will no longer receive updates. Can I move to a higher release?

I run a number of XARA-derived websites. My provider, Ionis, has sent me an email advising me to update to the latest version of PHP (to keep the current PHP7.2 incurs a significant additional cost).

Do XARA derived websites use PHP? If so what release and if I need to how do I upgrade it.

My experience is limited to the mechanics of creating an XDP Pro website and then filling in the various parameters to publish it. I know nothing about PHP except that is a programming program for dynamic websites (some years ago I did try to understand it but as I publish very simple websites I decided not to focus on this program).

I upgraded PHP on the IONIS website in the past and that action had no noticeable effect on my websites.

Apparently I run PHP 7.2 and later releases 7.3, 7.4, 8.0 are now available.

All this just confuses me.

Kind regards
Martin