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Error Identifier: equal.notAllowed

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 check(int $a, int $b): bool
{
	return $a == $b;
}

Why is it reported? #

This error is reported by phpstan/phpstan-strict-rules.

Loose comparison via == is not allowed. The == operator performs type juggling before comparing values, which can lead to unexpected results. For example, 0 == 'foo' evaluates to true in PHP versions before 8.0, and '' == null is true in all versions.

Using strict comparison (===) avoids these pitfalls by comparing both value and type.

How to fix it #

Replace the loose comparison operator with its strict equivalent:

 <?php declare(strict_types = 1);
 
 function check(int $a, int $b): bool
 {
-	return $a == $b;
+	return $a === $b;
 }

How to ignore this error #

You can use the identifier equal.notAllowed to ignore this error using a comment:

// @phpstan-ignore equal.notAllowed
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: equal.notAllowed

Rules that report this error #

• PHPStan\Rules\DisallowedConstructs\DisallowedLooseComparisonRule [1] phpstan/phpstan-strict-rules

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