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Error Identifier: class.implementsInternalTrait

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);

// In package vendor/some-library:
namespace SomeLibrary;

/** @internal */
trait InternalHelper
{
	public function helper(): void {}
}

// In your code:
namespace App;

class MyClass
{
	use \SomeLibrary\InternalHelper;
}

Why is it reported? #

The trait being used is marked as @internal, meaning it is not part of the library’s public API and may change or be removed without notice in future versions. Using internal traits from third-party packages makes the code dependent on implementation details that are not guaranteed to remain stable.

How to fix it #

Replace the internal trait with a public API alternative, or implement the needed functionality directly:

 <?php declare(strict_types = 1);
 
 namespace App;

 class MyClass
 {
-	use \SomeLibrary\InternalHelper;
+
+	public function helper(): void
+	{
+		// Own implementation
+	}
 }

How to ignore this error #

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

// @phpstan-ignore class.implementsInternalTrait
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: class.implementsInternalTrait

Rules that report this error #

• PHPStan\Rules\InternalTag\RestrictedInternalClassNameUsageExtension [1]

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