identical.alwaysFalse

Code example

<?php declare(strict_types = 1);

function doFoo(int $i): void
{
	if ($i === 'hello') {
		// ...
	}
}

Why is it reported?

A strict comparison using === between two values of incompatible types will always evaluate to false. The === operator checks both value and type equality, so comparing an int with a string can never be true.

In the example above, $i is an int and 'hello' is a string. These types can never be identical, so the condition will never be satisfied and the code inside the if block is dead code.

How to fix it

Fix the comparison to use the correct type:

 <?php declare(strict_types = 1);

 function doFoo(int $i): void
 {
-	if ($i === 'hello') {
+	if ($i === 42) {
 		// ...
 	}
 }

Or fix the parameter type if the comparison is correct:

 <?php declare(strict_types = 1);

-function doFoo(int $i): void
+function doFoo(string $i): void
 {
 	if ($i === 'hello') {
 		// ...
 	}
 }