unaryPlus.nonNumeric

Code example

<?php declare(strict_types = 1);

function doFoo(?int $value): void
{
	$result = +$value;
}

Why is it reported?

This error is reported by the phpstan-strict-rules package.

The unary + operator is applied to a non-numeric value. The unary plus operator is intended for numeric types (int, float). When applied to non-numeric types like null, string, or objects, PHP silently coerces the value, which can lead to unexpected results and hides type errors.

How to fix it

Ensure the operand is a numeric type before applying unary +:

 function doFoo(?int $value): void
 {
-	$result = +$value;
+	if ($value !== null) {
+		$result = +$value;
+	}
 }

Or cast the value explicitly if the coercion is intentional:

 function doFoo(?int $value): void
 {
-	$result = +$value;
+	$result = (int) $value;
 }