attribute.deprecatedTrait

Code example

<?php declare(strict_types = 1);

/** @deprecated Use NewTrait instead */
trait OldTrait
{
}

#[OldTrait]
class Foo
{
}

Why is it reported?

This error is reported by the phpstan-deprecation-rules extension.

An attribute references a trait that has been marked as @deprecated. Deprecated traits are planned for removal in a future version, and attributes should not rely on them.

Note: triggering this identifier requires using a trait as an attribute, which PHP does not support. PHPStan therefore always also reports an attribute.notAttribute error, and in practice the deprecation identifier is not reported alongside it.

How to fix it

Replace the deprecated trait with a proper attribute class:

-#[OldTrait]
+#[NewAttribute]
 class Foo
 {
 }