enum.implementsDeprecatedEnum

Code example

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

/** @deprecated */
enum OldStatus
{
	case Active;
}

enum Color implements OldStatus
{
	case Red;
}

Why is it reported?

The enum implements another enum that is marked as @deprecated. Implementing 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 another enum, which PHP itself forbids. PHPStan therefore always also reports a non-ignorable enumImplements.enum error alongside this one.

How to fix it

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

-enum Color implements OldStatus
+enum Color implements PublicInterface
 {
 	case Red;
 }