The AllowDynamicProperties attribute

The AllowDynamicProperties attribute

This attribute is used to mark classes that allow
.

dynamic properties

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

<?php
class DefaultBehaviour { }

#[\AllowDynamicProperties]
class ClassAllowsDynamicProperties { }

$o1 = new DefaultBehaviour();
$o2 = new ClassAllowsDynamicProperties();

$o1->nonExistingProp = true;
$o2->nonExistingProp = true;
?>

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

Attributes overview