This contribution stream is sponsored by Esteemed, Inc.
In this live development stream, I worked on PHPStan's ability to detect PHP 8 compatibility while still using PHP 7.4
* Identifying deprecated PHP internal functions: https://github.com/phpstan/phpstan/issues/5373
* define function's case insentivie parameter is deprecated: https://github.com/phpstan/phpstan-src/pull/589
