booleanOr.alwaysFalse

Code example

<?php declare(strict_types = 1);

function doFoo(int $i): void
{
    if (is_string($i) || is_array($i)) {
        // ...
    }
}

Why is it reported?

The result of the || (boolean or) expression is always false. Both the left and right sides of the expression evaluate to false for every possible value, which means the condition can never be satisfied and the code inside the if block is dead code. This typically happens when the types involved make one or both sides of the expression impossible to be truthy.

How to fix it

Fix the condition to match the intended logic:

 <?php declare(strict_types = 1);

-function doFoo(int $i): void
+function doFoo(int|string|array $i): void
 {
     if (is_string($i) || is_array($i)) {
         // ...
     }
 }

Or remove the always-false condition entirely:

 <?php declare(strict_types = 1);

 function doFoo(int $i): void
 {
-    if (is_string($i) || is_array($i)) {
-        // ...
-    }
 }