BackedEnum::from

(PHP 8 >= 8.1.0)

BackedEnum::from — Maps a scalar to an enum instance

Descrizione

public static BackedEnum::from(int|string $value): static

The from() method translates a string or int into the corresponding Enum case, if any. If there is no matching case defined, it will throw a ValueError.

Elenco dei parametri

value: The scalar value to map to an enum case.

Valori restituiti

A case instance of this enumeration.

Esempi

Example #1 Basic usage

The following example illustrates how enum cases are returned.

<?php
enum Suit: string
{
    case Hearts = 'H';
    case Diamonds = 'D';
    case Clubs = 'C';
    case Spades = 'S';
}

$h = Suit::from('H');

var_dump($h);

$b = Suit::from('B');
?>

Il precedente esempio visualizzerà:

enum(Suit::Hearts)

Fatal error: Uncaught ValueError: "B" is not a valid backing value for enum "Suit" in /file.php:15

Vedere anche:

UnitEnum::cases() - Generates a list of cases on an enum
BackedEnum::tryFrom() - Maps a scalar to an enum instance or null

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