enum.implementsDeprecatedClass

Code example

<?php declare(strict_types = 1); // lint >= 8.1

/** @deprecated */
class OldService
{
}

enum Status implements OldService
{
	case Active;
}

Why is it reported?

The enum implements a class that is marked as @deprecated. Internal classes are not intended to be implemented, and using deprecated types couples new code to APIs that are scheduled for removal. This rule is provided by phpstan-deprecation-rules.

Note: triggering this identifier requires an enum to implement a class (not an interface), which PHP itself forbids. PHPStan therefore always also reports a non-ignorable enumImplements.class error alongside this one.

How to fix it

Remove the deprecated class from the implements clause and use a proper public interface instead:

-enum Status implements OldService
+enum Status implements PublicInterface
 {
 	case Active;
 }