Error Identifier: staticMethod.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);

class Logger
{
	public static function log(string $message): bool
	{
		return file_put_contents('log.txt', $message) !== false;
	}
}

(void) Logger::log('Hello');

Why is it reported? #

The static method call is wrapped in a (void) cast, but the method does not require its return value to be used. The (void) cast is meant for explicitly discarding the return value of methods marked with #[\NoDiscard] to suppress the staticMethod.resultDiscarded error. When a method already allows its return value to be discarded, using (void) is unnecessary.

How to fix it #

Remove the (void) cast and call the method directly:

 <?php declare(strict_types = 1);
 
-(void) Logger::log('Hello');
+Logger::log('Hello');

If the return value is needed, assign it to a variable:

 <?php declare(strict_types = 1);
 
-(void) Logger::log('Hello');
+$success = Logger::log('Hello');

How to ignore this error #

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

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

Rules that report this error #

PHPStan\Rules\Methods\CallToStaticMethodStatementWithNoDiscardRule [1]

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