logicalAnd.resultUnused

Code example

<?php declare(strict_types = 1);

function doFoo(bool $a, bool $b): void
{
	$result = $a and $b;
}

Why is it reported?

The result of the and operator is unused. This is almost always a bug caused by the unexpected precedence of the and operator. The and operator has lower precedence than =, so $result = $a and $b is parsed as ($result = $a) and $b. The variable $result receives the value of $a, and the and $b part is evaluated but its result is discarded.

How to fix it

Use && instead of and, which has higher precedence than =:

 function doFoo(bool $a, bool $b): void
 {
-	$result = $a and $b;
+	$result = $a && $b;
 }

Or use parentheses to disambiguate:

 function doFoo(bool $a, bool $b): void
 {
-	$result = $a and $b;
+	$result = ($a and $b);
 }