Error Identifier: property.notWritable

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 ParentClass
{
	public string $name;
}

class ChildClass extends ParentClass
{
	public string $name {
		get => 'fixed';
	}
}

Why is it reported? #

A child class overrides a writable property from a parent class but makes it non-writable. In the example above, ParentClass::$name is writable, but ChildClass::$name only defines a get hook without a set hook, making it read-only. This violates the property contract established by the parent class.

How to fix it #

Ensure the overriding property also supports writes:

 <?php declare(strict_types = 1);
 
 class ChildClass extends ParentClass
 {
 	public string $name {
 		get => 'fixed';
+		set => $this->name = $value;
 	}
 }

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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