Error Identifier: property.parentPropertyFinal

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 Base
{
	final public string $name = 'base';
}

class Child extends Base
{
	public string $name = 'child';
}

Why is it reported? #

The child class overrides a property that is declared as final in the parent class. Final properties cannot be overridden by child classes. This is a PHP language-level restriction enforced since PHP 8.4.

Properties declared with private(set) visibility are also implicitly final, because the set operation cannot be overridden.

How to fix it #

Remove the overriding property declaration from the child class:

 class Child extends Base
 {
-	public string $name = 'child';
 }

If the child class needs different behavior, ask the parent class maintainer to remove the final keyword, or use a different property name:

 class Child extends Base
 {
-	public string $name = 'child';
+	public string $displayName = 'child';
 }

Non-ignorable error #

This error cannot be ignored using @phpstan-ignore or the ignoreErrors configuration. Non-ignorable errors indicate code that would cause a crash or a fatal error at runtime, or a fundamental problem in the analysed code that must be addressed.

Rules that report this error #

PHPStan\Rules\Properties\OverridingPropertyRule [1]

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