Previously:

• PHP 8.4 Compatibility #5946

PHP 8.5 is slated for November 2025. Here's an overview of what's new: https://php.watch/versions/8.5

Noteworthy:

• New array_first and array_last functions
  • There's a proposal to add polyfills in WP core
• Deprecated Reflection*::setAccessible() methods
  • As of PHP 8.1.0, calling these methods have no effect; all properties are accessible by default. As of PHP 8.5.0, they are now deprecated.
  • Some of our tests use these methods and thus cause deprecation warnings. We could wrap the relevant parts in conditionals (e.g. if ( PHP_VERSION_ID < 80100 )