TOPIC:

PHP 7.1 and 7.2 are no longer receiving security fixes.
See www.php.net/supported-versions.php

If your server uses either of these, you should upgrade to PHP 7.3 or 7.4.

Currently this affects about 18% of sites running webtrees 2.0.

In the next few months, I plan to release webtrees 2.1, which will add support for PHP 8.0 and drop support for PHP 7.1 and PHP 7.2.

After this time, the 2.0 code will only receive fixes for security and major bugs.