PHP 8.x Migration for WordPress

Complete reference for migrating WordPress themes, plugins, and custom code from PHP 7.4 to PHP 8.0, 8.1, 8.2, and 8.3. Covers new features, breaking changes, backward compatibility, and the most common migration patterns.

1. PHP 8.0 Features for WordPress

Named Arguments

Use with caution in WordPress hook callbacks. WordPress core functions do not guarantee parameter name stability across versions.