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Error Identifier: instanceof.deprecatedInterface

Every error reported by PHPStan has an error identifier. Here’s a list of all error identifiers. In PHPStan Pro you can see the error identifier next to each error and filter errors by their identifiers.

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) {
 		// ...
 	}

How to ignore this error #

You can use the identifier instanceof.deprecatedInterface to ignore this error using a comment:

// @phpstan-ignore instanceof.deprecatedInterface
codeThatProducesTheError();

You can also use only the identifier key to ignore all errors of the same type in your configuration file in the ignoreErrors parameter:

parameters:
	ignoreErrors:
		-
			identifier: instanceof.deprecatedInterface

Rules that report this error #

• PHPStan\Rules\Deprecations\RestrictedDeprecatedClassNameUsageExtension [1] phpstan/phpstan-deprecation-rules

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