Error Identifier: notEqual.invalid

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(stdClass $obj, int $number): void
{
	$result = $obj != $number; // error: Comparison operation "!=" between stdClass and int results in an error.
}

Why is it reported? #

PHP does not support loose comparison (!=) between certain type combinations. When comparing an object with a scalar type like int using !=, PHP cannot perform a meaningful comparison and will produce an error. The operation has no well-defined behavior for these types.

How to fix it #

Compare values of the same or compatible types, or extract a comparable value from the object first.

 function doFoo(stdClass $obj, int $number): void
 {
-	$result = $obj != $number;
+	$result = $obj->value !== $number;
 }

How to ignore this error #

You can use the identifier notEqual.invalid to ignore this error using a comment:

// @phpstan-ignore notEqual.invalid
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: notEqual.invalid

Rules that report this error #

PHPStan\Rules\Operators\InvalidComparisonOperationRule [1]

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