Error Identifier: attribute.trait
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]
trait MyAttribute
{
public function getValue(): string
{
return 'value';
}
}
Why is it reported? #
PHP requires attribute classes to be non-abstract classes. A trait cannot be used as an attribute class because PHP needs to instantiate the attribute when it is applied, and traits cannot be instantiated. Using #[\Attribute] on a trait is invalid and will cause a runtime error.
In the example above, MyAttribute is declared as a trait with the #[\Attribute] attribute, which is not allowed.
How to fix it #
Change the trait to a class:
<?php declare(strict_types = 1);
#[\Attribute]
-trait MyAttribute
+class MyAttribute
{
- public function getValue(): string
+ public function __construct(
+ public readonly string $value = 'value',
+ )
{
- return 'value';
}
}
How to ignore this error #
You can use the identifier attribute.trait to ignore this error using a comment:
// @phpstan-ignore attribute.trait
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.trait