PHP 8
Apparently some of the deprecations will make this the most backward compatibility breaking version jump of PHP since V4 to V5. (Read a german interview here: <a href="https://www.heise.de/news/PHP-8-im-Experten-Check-Der-erwartete-harte-Bruch-mit-der-Vergangenheit-4970530.html?wt_mc=rss.red.ho.ho.atom.beitrag.beitrag" rel="nofollow">https://www.heise.de/news/PHP-8-im-Experten-Check-Der-erwart...</a>)<p>There's a long report on Wordpress and PHP 8 and it's not pretty: <a href="https://developer.yoast.com/blog/the-2020-wordpress-and-php-8-compatibility-report/" rel="nofollow">https://developer.yoast.com/blog/the-2020-wordpress-and-php-...</a>