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Error Identifier: method.finalPrivate

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 Foo
{
	final private function doSomething(): void
	{
	}
}

Why is it reported? #

A private method is marked as final, which is unnecessary. The final keyword prevents a method from being overridden in child classes, but private methods are not visible to child classes and therefore can never be overridden. Marking a private method as final has no practical effect.

As of PHP 8.0, PHP itself emits a deprecation notice for this combination.

How to fix it #

Remove the final keyword from the private method.

 <?php declare(strict_types = 1);
 
 class Foo
 {
-	final private function doSomething(): void
+	private function doSomething(): void
 	{
 	}
 }

How to ignore this error #

You can use the identifier method.finalPrivate to ignore this error using a comment:

// @phpstan-ignore method.finalPrivate
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: method.finalPrivate

Rules that report this error #

• PHPStan\Rules\Methods\FinalPrivateMethodRule [1]

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