Error Identifier: attribute.noConstructor

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]
class MyAttribute
{
}

#[MyAttribute('some value')]
class Foo
{
}

Why is it reported? #

The attribute class does not have a constructor, but it is being instantiated with parameters. When an attribute class has no constructor, it cannot accept any arguments. Passing arguments to an attribute without a constructor will result in an error.

In the example above, MyAttribute has no constructor, so it cannot be used with the argument 'some value'.

How to fix it #

Add a constructor to the attribute class to accept the parameters:

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

 #[Attribute]
 class MyAttribute
 {
+    public function __construct(public string $value)
+    {
+    }
 }

 #[MyAttribute('some value')]
 class Foo
 {
 }

Or remove the arguments from the attribute usage:

 <?php declare(strict_types = 1);
 
-#[MyAttribute('some value')]
+#[MyAttribute]
 class Foo
 {
 }

How to ignore this error #

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

// @phpstan-ignore attribute.noConstructor
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.noConstructor

Rules that report this error #

PHPStan\Rules\Classes\ClassAttributesRule [1]
PHPStan\Rules\Classes\ClassConstantAttributesRule [1]
PHPStan\Rules\Constants\ConstantAttributesRule [1]
PHPStan\Rules\EnumCases\EnumCaseAttributesRule [1]
PHPStan\Rules\Functions\ArrowFunctionAttributesRule [1]
PHPStan\Rules\Functions\ClosureAttributesRule [1]
PHPStan\Rules\Functions\FunctionAttributesRule [1]
PHPStan\Rules\Functions\ParamAttributesRule [1]
PHPStan\Rules\Methods\MethodAttributesRule [1]
PHPStan\Rules\Properties\PropertyAttributesRule [1]
PHPStan\Rules\Properties\PropertyHookAttributesRule [1]
PHPStan\Rules\Traits\TraitAttributesRule [1]

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