dc/json

JSON Serializer

, _(*1)

Allow serializing directly to classes using only phpDoc and type hints., _(*2)

Installation

$ composer install dc/json

Or add it to composer.json:, _(*3)

"require": {
    "dc/json": "0.*"
}

$ composer install

This package suggests dc/ioc and dc/cache, but it really is a very strong recommendation. It will be painful or slow to use without it., _(*4)

, _(*5)

Getting started

Get hold of a new \DC\JSON\Serializer and start serializing:, _(*6)

class Cat {
    /** @var string */
    public $name;
}
$json = '[{ "name": "Sniffles" }, { "name": "Snuggles" }]'; 
$serializer = new \DC\JSON\Serializer();
$cats = $serializer->deserialize($catsJson, '\Cat[]');

If you are using a dc/ioc container, you'll need to do this:, _(*7)

\DC\JSON\IoC\SerializerSetup::setup($container);

Serialization handlers

You can register a serialization handler to change how a specific class is serialized. This is different from using the JsonSerializable interface in PHP, as a serialization handler allows you to change how built-in classes are serialized and deserialized., _(*8)

The interface itself is easy to implement. The library comes with one default handler, which serializes \DateTime objects to and from ISO-8601 format. Look at that handler for a good example., _(*9)

If you want to register serialization your own handlers, it is easiest to do using IoC:, _(*10)

$container->register('\MyHandler')->to('\DC\JSON\Handler')->withContainerLifetime();

How classes are constructed

Classes are constructed in this manner:, _(*11)

1. Look for the property names in the constructor. Use the constructor to fill in those values.
2. Look for public setters of the form setX for the remaining values (this is controlled by convention, which you can override). Use them.
3. Look for public properties for the remaining values.

So, given this class:, _(*12)

class Cat {
    private $name;
    private $age;
    public $paws = 4;

    function __construct($name) {
        $this->name = $name;
    }

    function setAge($age) {
        $this->age = $age;
    }
}

...and this JSON:, _(*13)

{
    "name": "Snuggles",
    "age": 6,
    "paws": 4
}

...These two are equivalent:, _(*14)

$cat = $serializer->deserialize($json, '\Cat');
// or
$cat = new \Cat("Snuggles");
$cat->setAge(6);
$cat->paws = 4;

Performance

It is no secret that json_decode and json_encode is a lot faster than this package. In fact, we use those internally for the actual serialization. The magic of this package gets applied before serialization and after deserialization., _(*15)

Using a combination of type hints and documentation, we are smart about constructing your objects the way they were intended to be constructed. But, parsing your documentation is resource intensive, therefore it is good practice to heed a few rules:, _(*16)

1. Try to keep the serializer instance around for multiple serializations. All of the reflection happens only the first time a class is encountered.
2. Install dc/cache and dc/cache-memcache, and provide it to the serializer. If you do, all the information obtained from the reflection is cached for a while.

When using a primed cache, deserializing is about 4-5 times as slow a json_decode., _(*17)