# The AllowDynamicProperties attribute

(PHP 8 >= 8.2.0)

## Introduction

This attribute is used to mark classes that allow dynamic properties.

> Note: Although attributes themselves are not inherited, the effect of the `AllowDynamicProperties` attribute is inherited. Child classes of a class marked with this attribute will also allow dynamic properties, even if they do not explicitly declare the attribute.

## Class synopsis

#[\Attribute]
final class AllowDynamicProperties {
/* Methods */
public __construct()
}

## Examples

Dynamic properties are deprecated as of PHP 8.2.0, thus using them without marking the class with this attribute will emit a deprecation notice.

Example #1 AllowDynamicProperties with non-existing property

`<?php
class DefaultBehaviour { }
#[\AllowDynamicProperties]
class ClassAllowsDynamicProperties { }
$o1 = new DefaultBehaviour();
$o2 = new ClassAllowsDynamicProperties();
$o1->nonExistingProp = true;
$o2->nonExistingProp = true;
?>`

Output of the above example in PHP 8.2:

    Deprecated: Creation of dynamic property DefaultBehaviour::$nonExistingProp is deprecated in file on line 10

Example #2 AllowDynamicProperties with non-existing property in inherited class

`<?php
class DefaultBehaviour { }
#[\AllowDynamicProperties]
class ClassAllowsDynamicProperties { }
class InheritedClassAllowsDynamicProperties extends ClassAllowsDynamicProperties { }
$o1 = new DefaultBehaviour();
$o2 = new InheritedClassAllowsDynamicProperties();
$o1->nonExistingProp = true;
$o2->nonExistingProp = true;
?>`

Output of the above example in PHP 8.2:

    Deprecated: Creation of dynamic property DefaultBehaviour::$nonExistingProp is deprecated in file on line 12

## See Also

Attributes overview

## Table of Contents

- AllowDynamicProperties::__construct — Construct a new AllowDynamicProperties attribute instance

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