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Error Identifier: spaceship.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 compare(int $number, object $item): int
{
	return $number <=> $item;
}

Why is it reported? #

The spaceship operator (<=>) is used to compare two values, but the types of the operands are not compatible for comparison. PHP cannot meaningfully compare a numeric type against an object or array using this operator, and it results in an error.

How to fix it #

Make sure both sides of the spaceship operator are of compatible types.

 <?php declare(strict_types = 1);
 
-function compare(int $number, object $item): int
+function compare(int $number, int $other): int
 {
-	return $number <=> $item;
+	return $number <=> $other;
 }

How to ignore this error #

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

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

Rules that report this error #

• PHPStan\Rules\Operators\InvalidComparisonOperationRule [1]

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