BackedEnum::tryFrom

(PHP 8 >= 8.1.0)

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

Descrizione

public static BackedEnum::tryFrom(int|string $value): ?static

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

Elenco dei parametri

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

Valori restituiti

A case instance of this enumeration, or null if not found.

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::tryFrom('H');

var_dump($h);

$b = Suit::tryFrom('B') ?? Suit::Spades;

var_dump($b);
?>

Il precedente esempio visualizzerà:

enum(Suit::Hearts)
enum(Suit::Spades)

Vedere anche:

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

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