staticProperty.deprecatedTrait

Code example

<?php declare(strict_types = 1);

/** @deprecated Use NewHelper instead */
trait OldHelper
{
	public static string $version = '1.0';
}

class MyClass
{
	use OldHelper;
}

echo OldHelper::$version;

Why is it reported?

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

A static property is accessed on a trait that is marked as @deprecated. Deprecated traits are scheduled for removal or replacement. Accessing static properties on them ties the code to an API that will eventually be removed.

How to fix it

Use the recommended replacement trait or class instead:

-echo OldHelper::$version;
+echo NewHelper::$version;

If the calling code is itself deprecated, the error will not be reported. Mark the function or class as deprecated if it is part of a deprecation migration:

+/** @deprecated */
 function doFoo(): void
 {
 	echo OldHelper::$version;
 }