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Error Identifier: attribute.enum

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);

#[\Attribute]
enum Suit
{
	case Hearts;
	case Diamonds;
}

Why is it reported? #

PHP attributes can only be applied to classes (not abstract). An enum cannot be used as an #[\Attribute] class because PHP requires attribute classes to be non-abstract, non-enum, non-interface, non-trait classes. Marking an enum with #[\Attribute] has no effect and would cause an error if the enum were ever used as an attribute on another declaration.

How to fix it #

Convert the attribute to a regular class:

 <?php declare(strict_types = 1);
 
-#[\Attribute]
-enum Suit
+#[\Attribute]
+class Suit
 {
-	case Hearts;
-	case Diamonds;
+	public function __construct(
+		public readonly string $value,
+	) {
+	}
 }

How to ignore this error #

You can use the identifier attribute.enum to ignore this error using a comment:

// @phpstan-ignore attribute.enum
codeThatProducesTheError();

You can also use only the identifier key to ignore all errors of the same type in your configuration file in the ignoreErrors parameter:

parameters:
	ignoreErrors:
		-
			identifier: attribute.enum

Rules that report this error #

• PHPStan\Rules\Classes\NonClassAttributeClassRule [1]

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