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Handlers

Introduction

Handlers allow you to change the serialization, or deserialization process for a single type/format combination.

Handlers are simple callback which receive three arguments: the visitor, the data, and the type.

Simple Callables

You can register simple callables on the builder object:

$builder
    ->configureHandlers(function(JMS\Serializer\Handler\HandlerRegistry $registry) {
        $registry->registerHandler('serialization', 'MyObject', 'json',
            function($visitor, MyObject $obj, array $type) {
                return $obj->getName();
            }
        );
    })
;

Subscribing Handlers

Subscribing handlers contain the configuration themselves which makes them easier to share with other users, and easier to set-up in general:

use JMS\Serializer\Handler\SubscribingHandlerInterface;
use JMS\Serializer\GraphNavigator;
use JMS\Serializer\JsonSerializationVisitor;
use JMS\Serializer\Context;

class MyHandler implements SubscribingHandlerInterface
{
    public static function getSubscribingMethods()
    {
        return array(
            array(
                'direction' => GraphNavigator::DIRECTION_SERIALIZATION,
                'format' => 'json',
                'type' => 'DateTime',
                'method' => 'serializeDateTimeToJson',
            ),
        );
    }

    public function serializeDateTimeToJson(JsonSerializationVisitor $visitor, \DateTime $date, array $type, Context $context)
    {
        return $date->format($type['params'][0]);
    }
}

Also, this type of handler is registered via the builder object:

$builder
    ->configureHandlers(function(JMS\Serializer\Handler\HandlerRegistry $registry) {
        $registry->registerSubscribingHandler(new MyHandler());
    })
;