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https://www.exakat.io/ https://www.exakat.io/ https://github.com/phpstan/phpstan https://github.com/phpstan/phpstan https://github.com/phan/phan https://github.com/phan/phan Lots of great static analyzers to run in CI and during development to catch all kinds of issues. Also, https://github.com/FriendsOfPhp/PHP-CS-Fixer https://github.com/FriendsOfPhp/PHP-CS-Fixer to clean up code syntax (configurable rules, has good presets).