class.implementsInternalTrait

Code example

<?php declare(strict_types = 1);

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

	class Foo {
		use InternalTrait;
	}
}

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

Why is it reported?

The class uses a trait in its implements clause that is marked as @internal. Internal types are not part of the library's public API and may change or be removed without notice in future versions.

A class cannot implement a trait in PHP -- traits 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

Use a public (non-internal) interface instead, or use the use keyword for traits:

-class MyClass implements \Vendor\InternalTrait {}
+class MyClass implements \Vendor\PublicInterface {}