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Error Identifier: attribute.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);

use Attribute;

#[Attribute]
interface MyAttribute
{
}

Why is it reported? #

Only classes can be used as PHP attribute classes. Interfaces, traits, and enums cannot be marked with the #[Attribute] attribute. PHP requires attribute classes to be non-abstract classes that can be instantiated.

In the example above, MyAttribute is an interface, which cannot serve as an attribute class.

How to fix it #

Change the type declaration to a class:

 <?php declare(strict_types = 1);
 
 use Attribute;

 #[Attribute]
-interface MyAttribute
+class MyAttribute
 {
 }

How to ignore this error #

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

// @phpstan-ignore attribute.class
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.class

Rules that report this error #

• PHPStan\Rules\Classes\NonClassAttributeClassRule [1]

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