Feature Description

Issues with static analysis were reported in #622 and fixed in #645 without actually incorporating PHPStan. Is there a reason why this wasn't done?

I suggest we incorporate szepeviktor/phpstan-wordpress into the tooling alongside PHPCS. This will ensure we catch more static analysis issues. While the plugin currently passes level 0 well enough, there are much more issues to find in the higher levels.

I'm happy to work on a PR if desired.