PHP 8.1 was released on 25 November 2021. PHP 8.1 contains new features, performance improvements, deprecations, and backward compatibility breaks. For more information, see the PHP 8.1 release page, changelog, and migration guide. WordPress is not fully compatible with PHP 8.0 or 8.1. All remaining known PHP 8.1 issues are deprecation notices. Please note, a … Continue reading WordPress 5.9 and PHP 8.0-8.1