JMSSerializerBundle不映射键等于0

Question

我正在使用JMSSerializerBundle，并且注意到序列化时的一种奇怪行为。

我使用的是$jsonItems =$序列化器->序列化( $invoiceitems，'json')；其中$invoiceitems如下：

array(2) {
  ["services"]=>
  array(3) {
    [1]=>
    array(1) {
      [0]=>
      object(stdClass)#757 (26) {
        ["__CLASS__"]=>
        string(43) "Evo\BackendBundle\Entity\InvoiceItemService"
        ["id"]=>
        int(4)
      }
    }
    [2]=>
    array(0) {
    }
    [3]=>
    array(1) {
      [1]=>
      object(stdClass)#846 (26) {
        ["__CLASS__"]=>
        string(43) "Evo\BackendBundle\Entity\InvoiceItemService"
        ["id"]=>
        int(7)
      }
    }
  }
  ["marchandises"]=>
  array(0) {
  }
}

我得到以下JSON：

{"services"{
    "1":[
        {"realDiscount":0,"id":4,"createdAt":"2014-08-22","description":"test 2","type":1,"totalFlat":75,"discountFlat":0,"discountFlatType":"%","chargedHours":0,"chargedMinutes":0,"hourlyRate":0,"discountHourly":0,"discountHourlyType":"%","chargedQuantity":0,"unitPrice":0,"discountQuantity":0,"discountQuantityType":"%","total":75,"discount":0,"discountType":"%","position":1,"chargedTime":0}
    ],
    "2":[],
    "3":{
        "1":{"realDiscount":0,"id":7,"createdAt":"2014-08-22","description":"test 22","type":3,"totalFlat":0,"discountFlat":0,"discountFlatType":"%","chargedHours":0,"chargedMinutes":0,"hourlyRate":0,"discountHourly":0,"discountHourlyType":"%","chargedQuantity":50,"unitPrice":1,"discountQuantity":0,"discountQuantityType":"%","total":50,"discount":0,"discountType":"%","position":1,"chargedTime":0}
    }
},
"marchandises":[]}

为什么在我的JSON字符串中，services1的格式与services3不同？如果我引用我的PHP数组，唯一的区别是services1的第一个键是0，而services3的第一个键是1，就像JMS序列化器在键等于0时不映射键一样。最后，我希望在JSON字符串中保持键等于0。

我怎么能这么做？

Answer 1

要将此逻辑应用于整个项目：

只需将这些行添加到序列化程序配置(config.yml)：

jms_serializer:    
    visitors:
        json:
            options: [JSON_FORCE_OBJECT]

来源：http://jmsyst.com/bundles/JMSSerializerBundle/master/configuration#extension-reference

若要在每次调用中应用此逻辑：

您必须创建一个EventSubscriber

<?php

namespace Acme\Api\Serializer;

use JMS\Serializer\EventDispatcher\Events;
use JMS\Serializer\EventDispatcher\EventSubscriberInterface;
use JMS\Serializer\EventDispatcher\PreSerializeEvent;
use JMS\Serializer\EventDispatcher\ObjectEvent;
use JMS\Serializer\JsonSerializationVisitor;

class JsonSerializationSubscriber implements EventSubscriberInterface
{
    /**
     * {@inheritdoc}
     */
    public static function getSubscribedEvents()
    {
        return array(
            array('event' => Events::PRE_SERIALIZE, 'method' => 'onPreSerialization', 'format' => 'json'),
            array('event' => Events::POST_SERIALIZE, 'method' => 'onPostSerialization', 'format' => 'json')
        );
    }

    /**
     * @param PreSerializeEvent $event
     */
    public function onPreSerialization(PreSerializeEvent $event)
    {
        $context = $event->getContext();

        if (!$context->attributes->contains('json_encode_options')) {
            return;
        }

        $visitor = $event->getVisitor();

        if ($visitor instanceof JsonSerializationVisitor) {
            $options = $visitor->getOptions();
            $context->setAttribute('__old_json_encode_options', $options);
            $visitor->setOptions($options | $context->attributes->get('json_encode_options'));
        }
    }

    /**
     * @param ObjectEvent $event
     */
    public function onPostSerialization(ObjectEvent $event)
    {
        $context = $event->getContext();

        if (!$context->attributes->contains('__old_json_encode_options')) {
            return;
        }

        $visitor = $event->getVisitor();

        if ($visitor instanceof JsonSerializationVisitor) {
            $visitor->setOptions($context->attributes->get('__old_json_encode_options'));
        }
    }
}

在配置文件中注册EventSubscriber：

services:
    acme.serializer.subscriber.json:
        class: Acme\Api\Serializer\JsonSerializationSubscriber

        tags:
            - {name: jms_serializer.event_subscriber}

然后，每当您想要使用它时：

$context = new SerializationContext();
$context->setAttribute('json_encode_options', JSON_FORCE_OBJECT);

$this->get('serializer')->serialize($var, 'json', $context);