classConstant.internal - Phpstan

Code example

php

<?php declare(strict_types = 1);

namespace Vendor {
	class Config {
		/** @internal */
		public const DEBUG_MODE = true;

		public const VERSION = '1.0';
	}
}

namespace App {
	function test(): bool {
		return \Vendor\Config::DEBUG_MODE; // error: Access to internal constant Vendor\Config::DEBUG_MODE from outside its root namespace Vendor.
	}
}

Why is it reported?

The class constant is marked as @internal and is being accessed from outside the package where it is defined. Internal constants are not part of the package's public API and may change or be removed without notice.

How to fix it

Use a public (non-internal) constant or API instead:

diff-php

 namespace App {
 	function test(): string {
-		return \Vendor\Config::DEBUG_MODE;
+		return \Vendor\Config::VERSION;
 	}
 }

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