class.extendsInternalTrait

Code example

<?php declare(strict_types = 1);

namespace Vendor {
	/** @internal */
	trait InternalTrait {}

	class Foo {
		use InternalTrait;
	}
}

namespace App {
	class MyClass extends \Vendor\InternalTrait {}
}

Why is it reported?

The class extends a type that is marked as @internal. Internal types are not part of the package's public API and may change or be removed without notice in future versions.

Traits cannot be extended in PHP -- they should be used with the use keyword inside a class body instead. This code is invalid regardless of the @internal annotation.

How to fix it

Do not extend traits. If the functionality is needed, use the use keyword with a non-internal trait:

-class MyClass extends \Vendor\InternalTrait {}
+class MyClass
+{
+	// Use the package's public API instead
+}

If no public alternative exists, consider reaching out to the package maintainers to request a public API for your use case.