StringValueObject - Base class for string VOs with validation (maxLength, notNull, notEmpty)
UuidValueObject - UUID v4 via ramsey/uuid
AtomDateValueObject - Dates in ATOM format

Example: custom Value Object

use Cohete\DDD\ValueObject\StringValueObject;

class UserEmail extends StringValueObject
{
    public static function from(?string $value = null): static
    {
        static::assertNotNull($value);
        static::assertNotEmpty($value);
        static::assertMaxLength(255, $value);

        if (!filter_var($value, FILTER_VALIDATE_EMAIL)) {
            throw new \InvalidArgumentException("Invalid email: $value");
        }

        return parent::from($value);
    }
}

License

MIT