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Error Identifier: function.inVoidCast

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(): string
{
	return 'hello';
}

(void) doFoo();

Why is it reported? #

A function call is wrapped in a (void) cast, but the function does not require its return value to be used. The (void) cast is a way to explicitly acknowledge that a return value is being discarded, but it is only necessary for functions marked with #[\NoDiscard]. For other functions, the cast is redundant.

How to fix it #

Remove the unnecessary (void) cast:

 <?php declare(strict_types = 1);
 
-(void) doFoo();
+doFoo();

How to ignore this error #

You can use the identifier function.inVoidCast to ignore this error using a comment:

// @phpstan-ignore function.inVoidCast
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: function.inVoidCast

Rules that report this error #

• PHPStan\Rules\Functions\CallToFunctionStatementWithNoDiscardRule [1]

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