Error Identifier: outOfClass.parent

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);

echo parent::FOO; // ERROR: Using parent outside of class scope.

Why is it reported? #

The keyword parent refers to the parent class of the class in which it is used. It can only appear inside a class definition that extends another class. Using parent outside of a class scope (for example, in a function or in the global scope) is a PHP error because there is no class context to resolve the parent from.

This error is reported in various contexts: accessing constants (parent::FOO), calling static methods (parent::method()), accessing static properties (parent::$prop), using new parent(), or using parent in an instanceof check.

How to fix it #

Use the fully qualified class name instead of parent when outside a class:

 <?php declare(strict_types = 1);
 
-echo parent::FOO;
+echo BaseClass::FOO;

Or move the code inside a class method where parent is valid:

<?php declare(strict_types = 1);

class BaseClass
{
	public const FOO = 'bar';
}

class ChildClass extends BaseClass
{
	public function doFoo(): void
	{
		echo parent::FOO; // This works inside a class that extends another
	}
}

How to ignore this error #

You can use the identifier outOfClass.parent to ignore this error using a comment:

// @phpstan-ignore outOfClass.parent
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: outOfClass.parent

Rules that report this error #

PHPStan\Rules\Classes\ClassConstantRule [1]
PHPStan\Rules\Classes\ExistingClassInInstanceOfRule [1]
PHPStan\Rules\Classes\InstantiationRule [1]
PHPStan\Rules\Methods\CallStaticMethodsRule [1]
PHPStan\Rules\Methods\StaticMethodCallableRule [1]
PHPStan\Rules\Properties\AccessStaticPropertiesInAssignRule [1]
PHPStan\Rules\Properties\AccessStaticPropertiesRule [1]

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