Using PHPStan is not just about getting to level 8 with less than 100 ignored cases. Yes, there are also [official extensions](https://packagist.org/?query=phpstan%2Fphpstan-) that improve the type support of Symfony, Doctrine, and Laravel projects.

But more rules are needed to get our PHP project into a future-proof state.

**It takes less effort than getting to level 5 and we can use them since day one**. That's why I love them so much.

Tomas Votruba

To ensure long-term code quality in Symfony projects, implementing custom PHPStan rules can be highly effective. These rules help maintain a clean codebase by promoting practices like clear constructor injection, avoiding service locators, and preventing route prefixing. By following these rules, projects can remain robust and maintainable even after the original developers have left.

Custom PHPStan Rules to Improve Every Symfony project