There's been some controversy lately about a PHP RFC to deprecate "dynamic properties" in PHP 8.2, and then remove them in PHP 9.0. So I wrote down some of my thoughts about it, along with a tip for using static analyzers to determine if this might be a problem in your own codebases. https://whateverthing.com/blog/2021/11/13/whats-the-deal-with-dynamic-properties/