BackedEnum.md

The BackedEnum interface

(PHP 7, PHP 8)

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

• UnitEnum::cases — Generates a list of cases on an enum
• BackedEnum::from — Maps a scalar to an enum instance or null
• BackedEnum::tryFrom — Maps a scalar to an enum instance or null