Data Transfer Object

Simple library for encoding and decoding JSON structures into PHP objects, e.g. to work with API responses in a strongly typed way.

Installation

You can install the package via composer:

composer require antwerpes/data-transfer-object

Usage

Define a class that extends Antwerpes\DataTransferObject\DataTransferObject and define the structure of the object:

use Antwerpes\DataTransferObject\Attributes\Cast;
use Antwerpes\DataTransferObject\Attributes\Map;
use Antwerpes\DataTransferObject\Casts\ArrayCaster;
use Antwerpes\DataTransferObject\DataTransferObject;

class User extends DataTransferObject
{
    public function __construct(
        public string $name,
        #[Cast(CustomDateCaster::class)]
        public DateTimeInterface $birthday,
        #[Map(from: 'address.city')]
        public string $city,
        #[Cast(ArrayCaster::class, itemType: Interest:class)]
        public array $interests,
    ) {}
}

Then you can use the class to decode JSON strings into PHP objects:

$json = '{
    "name": "John Doe",
    "birthday": "1990-01-01",
    "address": {
        "city": "New York"
    },
    "interests": [
        {
            "name": "Music"
        },
        {
            "name": "Programming"
        }
    ]
}';
$user = User::decode(json_decode($json, true));
$encoded = $user->encode();

Custom Casters

You can define custom casters by implementing the Antwerpes\DataTransferObject\CastsProperty interface:

use Antwerpes\DataTransferObject\CastsProperty;

class CustomDateCaster implements CastsProperty
{
    public function unserialize(mixed $value): DateTimeInterface
    {
        return new DateTime($value);
    }
    
    public function serialize(mixed $value): string
    {
        return $value->format('Y-m-d');
    }
}

Mapping

You can map nested properties to a flat structure using the Map attribute:

use Antwerpes\DataTransferObject\Attributes\Map;

class User extends DataTransferObject
{
    public function __construct(
        #[Map(from: 'address.city', to: 'address.city')]
        public string $city,
    ) {}
}

Validation

Validation is out of scope for this package, use JSON schemas or other libraries like symfony/validator to validate the object.

Changelog

Please see CHANGELOG for more information on what has changed recently.

Contributing

Contributions are welcome! Leave an issue on GitHub, or create a Pull Request.

Credits

• Elisha Witte
• All Contributors

License

The MIT License (MIT). Please see License File for more information.