PHP Manual: Attribute

Introduction

Attributes offer the ability to add structured, machine-readable metadata information on declarations in code: Classes, methods, functions, parameters, properties and class constants can be the target of an attribute. The metadata defined by attributes can then be inspected at runtime using the Reflection APIs. Attributes could therefore be thought of as a configuration language embedded directly into code.

Class synopsis

#[\Attribute(\Attribute::TARGET_CLASS)]
final class Attribute {

/* Constants */

const int TARGET_CLASS;

const int TARGET_FUNCTION;

const int TARGET_METHOD;

const int TARGET_PROPERTY;

const int TARGET_CLASS_CONSTANT;

const int TARGET_PARAMETER;

const int TARGET_CONSTANT;

const int TARGET_ALL;

const int IS_REPEATABLE;

/* Properties */

public int $flags;

/* Methods */

public function __construct(int $flags = Attribute::TARGET_ALL)

}

Predefined Constants

Attribute::TARGET_CLASS
Attribute::TARGET_FUNCTION
Attribute::TARGET_METHOD
Attribute::TARGET_PROPERTY
Attribute::TARGET_CLASS_CONSTANT
Attribute::TARGET_PARAMETER
Attribute::TARGET_CONSTANT
Attribute::TARGET_ALL
Attribute::IS_REPEATABLE

Properties

flags

Changelog

Version	Description
8.5.0	Added `Attribute::TARGET_CONSTANT`. Applying `#[\Attribute]` to an abstract class, enum, interface, or trait now triggers a compile-time error (previously it was only reported at runtime when ReflectionAttribute::newInstance() was called).

The Attribute attribute

Introduction

Class synopsis

Predefined Constants

Properties

Changelog

See Also

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