Json Handler

Just a light and simple JSON helper that will make it easy for you to deal with json and objects.

Installation

composer require andreypostal/json-handler-php

Usage

Classes

When creating your Value Objects that represent a JSON entity you just need to add the JsonItemAttribute to each property that will be present in the JSON.

use \Andrey\JsonHandler\Attributes\JsonItemAttribute;

// { "id": 123, "name": "my name" }
class MyObject {
    #[JsonItemAttribute]
    public int $id;
    #[JsonItemAttribute]
    public name $name;
}

In the case of the entire object being a JsonObject with a direct 1:1 match (or perfect mirror of the keys), you can use the JsonObjectAttribute

use \Andrey\JsonHandler\Attributes\JsonObjectAttribute;

// { "id": 123, "name": "my name" }
#[JsonObjectAttribute]
class MyObject {
    public int $id;
    public string $name;
}

You can also combine both when need to add custom key or if you want to make an item required.

use \Andrey\JsonHandler\Attributes\JsonObjectAttribute;
use \Andrey\JsonHandler\Attributes\JsonItemAttribute;

// { "id": 123, "custom_name": "my name" }
#[JsonObjectAttribute]
class MyObject {
    public int $id;
    #[JsonItemAttribute(key: 'custom_name')]
    public string $name;
}

If your Value Object has some property that won't be present in the JSON, you can just omit the attribute for it and the other ones will be processed normally.

use \Andrey\JsonHandler\Attributes\JsonItemAttribute;

// { "id": 123 }
class MyObject {
    #[JsonItemAttribute]
    public int $id;
    public int $myAppGeneratesIt;
}

In case the items are required to exist in the JSON being processed, you must add the required flag in the attribute.

use \Andrey\JsonHandler\Attributes\JsonItemAttribute;

// { "id": 123 } or { "id": 123, "name": "my name" }
class MyObject {
    #[JsonItemAttribute(required: true)]
    public int $id;
    #[JsonItemAttribute]
    public string $name;
}

When some of the keys in your JSON are different from your object, you can include the JSON key in the attribute.

use \Andrey\JsonHandler\Attributes\JsonItemAttribute;

// { "customer_name": "the customer name" }
class MyObject {
    #[JsonItemAttribute(key: 'customer_name')]
    public string $name;
}

Also, if you have a property that is an array of other object, you must inform the class in the attribute using the type option. This will work as a hint so the hydrator can instantiate the appropriate object. This works with enums as well.

use \Andrey\JsonHandler\JsonItemAttribute;
use \MyNamespace\MyOtherObj;

// { "list": [ { "key": "value" } ] }
class MyObject {
    /** @var MyOtherObj[] */
    #[JsonItemAttribute(type: MyOtherObj::class)]
    public array $list;
}

The type option can be used to validate that all the items in an array have some desired type as well, like "string", "integer"...

Handler

In order to utilize the definitions mentioned above, you must utilize the JsonHandler. Two traits are available as well, the JsonHydratorTrait and JsonSerializerTrait that provide the methods both for serialization and hydration.

use \Andrey\JsonHandler\JsonHandler;
use \MyNamespace\MyObject;

$handler = new JsonHandler();

$myObject = new MyObject();

// This parses the json string and hydrates the original object, modifying it
$handler->hydrateObject($jsonString, $myObject);

// If you don't want to modify the original object you can use the immutable hydration
$hydratedObject = $handler->hydrateObjectImmutable($jsonString, $myObject);

// You can also use an array to hydrate the object
$handler->hydrateObject($jsonArr, $myObject);

// And to fetch the information as an array you can just serialize it using the handler.
// This allows you to easily implement the JsonSerializable interface in your object.
$arr = $handler->serialize($myObject);

// The json handler also provides the methods to decode and encode
$jsonString = JsonHandler::Encode($arr);
$jsonArr = JsonHandler::Decode($jsonString);