https://github.com/PHPCheckstyle/phpcheckstyle

https://scrutinizer-ci.com/

--- PSALM ---
https://github.com/vimeo/psalm
https://psalm.dev/

------------------
https://www.sonarqube.org/

https://github.com/phpstan/phpstan

https://github.com/phan/phan

https://github.com/overtrue/phplint

https://phpmd.org/