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Using Enums with PHP 8.1

Doctrine ORM 2.11 introduced support for PHP 8.1 enums. To make use of backed enums with doctrine-laminas-hydrator, you need to set up a hydration strategy.

The Enum and Entity

The following example uses a card with an enum representing hearts, diamonds, clubs or spades:

1enum Suit: string {
    case Hearts = 'H';
    case Diamonds = 'D';
    case Clubs = 'C';
    case Spades = 'S';
}

#[Entity]
class Card
{
    /** ... */

    #[Column(type: 'string', enumType: Suit::class)]
    public Suit $suit;

    public function getSuit(): Suit
    {
        return $this->suit;
    }

    public function setSuit(Suit $suit): void
    {
        $this->suit = $suit;
    }
}


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Custom Hydration Strategy

Next, you need to create a hydration strategy for your backed enum:

1namespace Application\Hydrator\Strategy;

use Laminas\Hydrator\Strategy\StrategyInterface;

class SuitHydratorStrategy implements StrategyInterface
{
    public function extract($value, ?object $object = null): ?int
    {
        return null === $value ? null : Suit::tryFrom($value)->value;
    }

    public function hydrate($value, ?array $data): ?Suit
    {
        return null === $value ? null : Suit::tryFrom($value);
    }
}


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Usage Example

Once you have enum, entity and strategy set up, you can wire it all together by adding the strategy to the relevant field in your hydrator.

1$hydrator = new DoctrineHydrator($entityManager);
$hydrator->addStrategy('suit', new \Application\Hydrator\Strategy\SuitHydratorStrategy());

$card = new Card();
$hydrator->hydrate([ 'suit' => 'H' ], $card);


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