Error Identifier: plus.rightNonNumeric

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);

$result = 1 + new stdClass();

Why is it reported? #

The + operator in PHP performs arithmetic addition on numeric types or array union on arrays. Using a non-numeric, non-array type on the right side of + is a type error that leads to unexpected behaviour or a runtime fatal error.

This rule is part of phpstan-strict-rules.

How to fix it #

Ensure the right operand is a numeric type:

-$result = 1 + $input;
+$result = 1 + (int) $input;

Or use the correct operation for the intended types:

-$result = $string + $otherString;
+$result = $number + $otherNumber;

How to ignore this error #

You can use the identifier plus.rightNonNumeric to ignore this error using a comment:

// @phpstan-ignore plus.rightNonNumeric
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: plus.rightNonNumeric

Rules that report this error #

PHPStan\Rules\Operators\OperandsInArithmeticAdditionRule [1] phpstan/phpstan-strict-rules

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