Error Identifier: property.abstractOverridingNonAbstractHook

← Back to property.*

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);

abstract class ParentClass
{
	public int $bar { get => 42; }
}

abstract class ChildClass extends ParentClass
{
	abstract public int $bar { get; }
}

Why is it reported? #

PHP does not allow redeclaring a concrete (non-abstract) property hook as abstract in a child class. The parent class already provides an implementation of the get (or set) hook, and making it abstract in a subclass would remove that implementation.

This applies to both get and set hooks independently. If a parent class provides concrete implementations of both hooks and the child class declares both as abstract, each one is reported separately.

Property hooks are a PHP 8.4 feature.

How to fix it #

If the child class needs a different hook implementation, override it with a concrete body:

 abstract class ChildClass extends ParentClass
 {
-	abstract public int $bar { get; }
+	public int $bar { get => 0; }
 }

If the intent is to keep the parent’s hook implementation, remove the abstract property declaration from the child class:

 abstract class ChildClass extends ParentClass
 {
-	abstract public int $bar { get; }
 }

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]