Attribute

Description: Marks a class as a custom reusable attribute that can be applied to other declarations.

Namespace: Built-in PHP (no import required)

Since: PHP 8.0

Usage

#[Attribute]
class MyCustomAttribute
{
    public function __construct(public string $value) {}
}

#[MyCustomAttribute('example')]
class SomeClass {}

You can restrict where the attribute is allowed to be used:

use Attribute;

#[Attribute(Attribute::TARGET_CLASS | Attribute::TARGET_METHOD)]
class OnlyForClassesAndMethods
{
    public function __construct(public string $label) {}
}

Target Constants

Constant	Description
Attribute::TARGET_CLASS	Can be applied to classes
Attribute::TARGET_FUNCTION	Can be applied to functions
Attribute::TARGET_METHOD	Can be applied to methods
Attribute::TARGET_PROPERTY	Can be applied to properties
Attribute::TARGET_CLASS_CONSTANT	Can be applied to class constants
Attribute::TARGET_PARAMETER	Can be applied to parameters
Attribute::TARGET_ALL	Can be applied to all declarations (default)
Attribute::IS_REPEATABLE	The attribute may be applied more than once to the same declaration

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