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

}

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

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