To use this extension, require it in Composer:
composer require --dev phpstan/phpstan-deprecation-rules
If you also install phpstan/extension-installer then you're all set!
Manual installation
If you don't want to use phpstan/extension-installer, include rules.neon in your project's PHPStan config:
includes:
- vendor/phpstan/phpstan-deprecation-rules/rules.neon
This extension emits deprecation warnings on code, which uses properties/functions/methods/classes which are annotated as @deprecated.
In case you don't own the code which you want to be considered deprecated, use PHPStan Stub Files to declare deprecations for vendor files like:
/** @deprecated */
class ThirdPartyClass {}