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Error Identifier: class.duplicateEnumCase

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);

enum Suit: string
{
	case Hearts = 'hearts';
	case Diamonds = 'diamonds';
	case Hearts = 'h';
}

Why is it reported? #

An enum declares the same case name more than once. PHP does not allow redeclaring an enum case within the same enum body. This is a fatal error.

In the example above, the case Hearts is declared twice in the enum Suit.

How to fix it #

Remove the duplicate enum case declaration, keeping only one:

 <?php declare(strict_types = 1);
 
 enum Suit: string
 {
 	case Hearts = 'hearts';
 	case Diamonds = 'diamonds';
-	case Hearts = 'h';
 }

If the duplicate cases were intended to represent different values, rename one of them:

 <?php declare(strict_types = 1);
 
 enum Suit: string
 {
 	case Hearts = 'hearts';
 	case Diamonds = 'diamonds';
-	case Hearts = 'h';
+	case HeartsShort = 'h';
 }

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\DuplicateDeclarationRule [1]

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