The Attribute attribute

    (PHP 8)

    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]
    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)
    }

    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).

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