# The BackedEnum interface

(PHP 8 >= 8.1.0)

## Introduction

The BackedEnum interface is automatically applied to backed enumerations by the engine. It may not be implemented by user-defined classes. Enumerations may not override its methods, as default implementations are provided by the engine. It is available only for type checks.

## Interface synopsis

interface BackedEnum extends UnitEnum {
/* Methods */
public static from(int|string `$value`): static
public static tryFrom(int|string `$value`): ?static
/* Inherited methods */
public static UnitEnum::cases(): array
}

## Table of Contents

- BackedEnum::from — Maps a scalar to an enum instance
- BackedEnum::tryFrom — Maps a scalar to an enum instance or null

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