Before you upgrade PHP, check your plugins and themes. The scanner reads their code and lists every file and line that will break, or start throwing warnings, on the PHP version you pick (7.4 to 8.4). It checks any plugin or theme installed on the site, including premium and custom ones. It is a PHP compatibility checker built on PHP_CodeSniffer and the PHPCompatibility ruleset. The plugin ships the current development version of that ruleset instead of its last stable release from 2019, so changes made in PHP 8.1, 8.2, 8.3 and 8.4 are covered. PHP 8.2 stops receiving security fixes on 31 Dece...
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