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Error Identifier: instanceof.invalidExprType

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);

function doFoo(object $obj, int $type): void
{
	if ($obj instanceof $type) {
		// ...
	}
}

Why is it reported? #

The right-hand side of instanceof is an expression whose type is neither a string nor an object. PHP requires the right-hand side of instanceof to be either a class name (string) or an object instance. Using a value of type int, array, or other non-string/non-object types will result in a runtime error.

How to fix it #

Pass a class name string or an object:

 <?php declare(strict_types = 1);
 
-function doFoo(object $obj, int $type): void
+function doFoo(object $obj, string $type): void
 {
 	if ($obj instanceof $type) {
 		// ...
 	}
 }

How to ignore this error #

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

// @phpstan-ignore instanceof.invalidExprType
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.invalidExprType

Rules that report this error #

• PHPStan\Rules\Classes\ImpossibleInstanceOfRule [1]

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