AllowDynamicProperties

Description: Marks a class to allow dynamic (undeclared) properties without emitting a deprecation notice.

Namespace: Built-in PHP (no import required)

Since: PHP 8.2

Usage

Dynamic properties are deprecated as of PHP 8.2. Without this attribute, assigning to an undeclared property emits a deprecation notice.

#[\AllowDynamicProperties]
class UserSession
{
    public string $id;
}

$session = new UserSession();
$session->id = 'abc123';
$session->extraData = 'some value'; // No deprecation notice

Note: The effect is inherited. Child classes of a class marked with this attribute will also allow dynamic properties, even without explicitly declaring it.

#[\AllowDynamicProperties]
class Base {}

class Child extends Base {}

$child = new Child();
$child->dynamic = true; // Also allowed

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