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php - 在数组 PHP 中添加键

问题描述

我正在学习数组，我想知道如何为这种数组添加密钥？

{  
   "items":[  
      {  
         "count":"1",
         "id":123,
         "description":"Bag",
         "price":11

      },
      {  
         "count":1,
         "id":1234,
         "description":"10% Discount",
         "price":-1.1

      }
   ],
   "total":9.9,
   "discount_total":9.9
}

因为我需要将数组转换为基于数组内的 id 的键。

{  
   "items":{  
      "123":{  
         "count":"1",
         "cart_id":123,
         "description":"Bag",
         "price":11
      },
      "1234":{  
         "count":1,
         "cart_id":1234,
         "description":"10% Discount",
         "price":-1.1
      }
   },
   "total":9.9,
   "discount_total":9.9
}

这是我的代码

header('Content-Type: application/json');
$cart_array = json_decode('{  
   "items":[  
      {  
         "count":"1",
         "cart_id":123,
         "plu":"TP16",
         "description":"Bag"

      },
      {  
         "count":1,
         "cart_id":1234,
         "plu":"DISCT10",
         "description":"10% Discount"

      }
   ],
   "total":9.9,
   "discount_total":9.9
}');

foreach ($cart_array->items as $item)
{
    $construct["cart_id"] = $item->cart_id;
}

我想问如何将id放入数组中？我不能使用$cart_array['id'] = $value，它返回错误。

未捕获的错误：不能将 stdClass 类型的对象用作数组

我真的可以在这里使用一些解释

标签： phparrays

解决方案

以下代码可以帮助您。

<?php
$json = '{  
   "items":[  
      {  
         "count":"1",
         "cart_id":123,
         "plu":"TP16",
         "description":"Small Four Seasons"

      },
      {  
         "count":1,
         "cart_id":1234,
         "plu":"DISCT10",
         "description":"10% Discount"

      }
   ],
   "total":9.9,
   "discount_total":9.9
}';
$data = json_decode($json,TRUE); //json decode 
foreach ($data['items'] as $key => $value) 
{
    $data['items'][$value['cart_id']] = $value;
    unset($data['items'][$key]);
} 
echo "<pre>";print_r($data);die;
?>

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