instanceof.deprecatedInterface

Code example

<?php declare(strict_types = 1);

/** @deprecated Use NewInterface instead */
interface OldInterface {}

function doFoo(object $obj): void
{
	if ($obj instanceof OldInterface) {
		// ...
	}
}

Why is it reported?

The instanceof check references the interface OldInterface, which is marked as @deprecated. Using deprecated interfaces indicates reliance on code that is slated for removal in a future version.

This rule is provided by the phpstan-deprecation-rules extension.

How to fix it

Replace the deprecated interface with its recommended replacement:

-	if ($obj instanceof OldInterface) {
+	if ($obj instanceof NewInterface) {
 		// ...
 	}