Error Identifier: enumImplements.class

Every error reported by PHPStan has an error identifier. Here’s a list of all error identifiers. In PHPStan Pro you can see the error identifier next to each error and filter errors by their identifiers.

Code example #

<?php declare(strict_types = 1);

class SomeClass
{
}

enum Status implements SomeClass
{
	case Active;
}

Why is it reported? #

An enum uses implements to reference a class instead of an interface. In PHP, enums can only implement interfaces. Attempting to implement a class will cause a fatal error.

How to fix it #

Replace the class with an interface:

 <?php declare(strict_types = 1);
 
-class SomeClass
+interface SomeInterface
 {
 }

-enum Status implements SomeClass
+enum Status implements SomeInterface
 {
 	case Active;
 }

Non-ignorable error #

This error cannot be ignored using @phpstan-ignore or the ignoreErrors configuration. Non-ignorable errors indicate code that would cause a crash or a fatal error at runtime, or a fundamental problem in the analysed code that must be addressed.

Rules that report this error #

PHPStan\Rules\Classes\ExistingClassesInEnumImplementsRule [1]

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