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Error Identifier: logicalAnd.leftAlwaysFalse

Every error reported by PHPStan has an error identifier. Here’s a list of all error identifiers. In PHPStan Pro you can see the error identifier next to each error and filter errors by their identifiers.

Code example #

<?php declare(strict_types = 1);

function doFoo(): void
{
	$zero = 0;
	if ($zero and rand(0, 1)) {
		// unreachable
	}
}

Why is it reported? #

The left side of the and expression always evaluates to false. Since and short-circuits, the right side is never evaluated and the entire expression is always false. The branch body is dead code. This typically indicates a logic error or a variable that was not assigned the intended value.

How to fix it #

Fix the left-hand condition so it can be true:

 function doFoo(): void
 {
-	$zero = 0;
-	if ($zero and rand(0, 1)) {
+	$value = rand(0, 1);
+	if ($value and rand(0, 1)) {
 		// ...
 	}
 }

Or remove the dead branch entirely:

 function doFoo(): void
 {
 	$zero = 0;
-	if ($zero and rand(0, 1)) {
-		// unreachable
-	}
 }

How to ignore this error #

You can use the identifier logicalAnd.leftAlwaysFalse to ignore this error using a comment:

// @phpstan-ignore logicalAnd.leftAlwaysFalse
codeThatProducesTheError();

You can also use only the identifier key to ignore all errors of the same type in your configuration file in the ignoreErrors parameter:

parameters:
	ignoreErrors:
		-
			identifier: logicalAnd.leftAlwaysFalse

Rules that report this error #

• PHPStan\Rules\Comparison\BooleanAndConstantConditionRule [1]

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