JSON to PHP

<?php

declare(strict_types=1);

use JsonSerializable;

class Profile implements JsonSerializable
{
    public function __construct(
        public string $bio,
        public int $reputation,
    ) {}

    public static function fromArray(array $data): self
    {
        return new self(
            bio: (string) ($data["bio"] ?? ""),
            reputation: (int) ($data["reputation"] ?? 0),
        );
    }

    public function jsonSerialize(): array
    {
        return [
            "bio" => $this->bio,
            "reputation" => $this->reputation,
        ];
    }
}

class Root implements JsonSerializable
{
    public function __construct(
        public int $id,
        public string $name,
        public string $email,
        public bool $isAdmin, // json: is_admin
        /** @var string[] */
        public array $roles,
        public Profile $profile,
    ) {}

    public static function fromArray(array $data): self
    {
        return new self(
            id: (int) ($data["id"] ?? 0),
            name: (string) ($data["name"] ?? ""),
            email: (string) ($data["email"] ?? ""),
            isAdmin: (bool) ($data["is_admin"] ?? false),
            roles: (array) ($data["roles"] ?? []),
            profile: isset($data["profile"]) && is_array($data["profile"]) ? Profile::fromArray($data["profile"]) : null,
        );
    }

    public function jsonSerialize(): array
    {
        return [
            "id" => $this->id,
            "name" => $this->name,
            "email" => $this->email,
            "is_admin" => $this->isAdmin,
            "roles" => $this->roles,
            "profile" => $this->profile?->jsonSerialize(),
        ];
    }
}