logicalOr.resultUnused

Code example

<?php declare(strict_types = 1);

function doFoo(bool $a, bool $b): void
{
	$result = $a or $b; // ERROR: Unused result of "or" operator.
}

Why is it reported?

The or keyword has lower precedence than the = assignment operator. This means the expression $result = $a or $b is parsed as ($result = $a) or $b, not as $result = ($a or $b). The assignment of $a to $result happens first, and then the or $b part is evaluated but its result is discarded.

This is almost always a mistake where the developer intended to assign the result of the logical OR to the variable.

How to fix it

Use || instead of or to get the expected precedence:

 <?php declare(strict_types = 1);

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

Or add explicit parentheses to clarify the intended grouping:

 <?php declare(strict_types = 1);

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