← Back to cast.*

Error Identifier: cast.useless

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(int $value): void
{
    $result = (int) $value;
}

Why is it reported? #

The value being cast is already of the target type, making the cast redundant. In the example above, $value is already an int, so casting it to int with (int) has no effect.

This rule is part of phpstan-strict-rules and helps identify unnecessary type casts that add clutter to the code without changing behaviour.

How to fix it #

Remove the unnecessary cast:

 <?php declare(strict_types = 1);
 
 function doFoo(int $value): void
 {
-    $result = (int) $value;
+    $result = $value;
 }

How to ignore this error #

You can use the identifier cast.useless to ignore this error using a comment:

// @phpstan-ignore cast.useless
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: cast.useless

Rules that report this error #

• PHPStan\Rules\Cast\UselessCastRule [1] phpstan/phpstan-strict-rules

Edit this page on GitHub