JSON 解码、解析 JSON 响应和整数值的未定义索引

Question

这太奇怪了，我已经为此工作了三天，在网上四处寻找解决方案并进行了自己的更改，但仍然没有运气。我正在尝试使用 Laravel 和来自 JoeDawson/amazon-ecs 的这个很棒的包裹将亚马逊产品检索到我的网站。当我像下面这样从控制器执行命令时：

$results = Amazon::search('tv')->json();
dd($results)

我可以这样查看来自亚马逊的所有数据：

array:2 [
  "OperationRequest" => array:4 [
    ...
  ]
  "Items" => array:5 [
    ...
    "Item" => array:10 [
      ...
      "ItemAttributes" => array:22 [
          "Binding" => "Electronics"
          "Brand" => "LG Electronics"
          "Color" => "Black"
          "EAN" => "8806087769050"
          "EANList" => array:1 [
            "EANListElement" => "8806087769050"
          ]
          "Feature" => array:4 [
            0 => "High dynamic contrast ratio (5M:1) - richer colors, deeper blacks and greater depth of image"
            1 => "Gaming and cinema modes - dedicated features to optimise viewing experiences"
            2 => "USB AutoRun - media content from USB stick runs automatically as soon as TV is switched on"
            3 => "Detachable base - easy way to wall mount your TV and enjoy a viewing experience while saving space"
          ]
          "ItemDimensions" => array:4 [
            "Height" => "226"
            "Length" => "1560"
            "Weight" => "948"
            "Width" => "2526"
          ]
          "Label" => "LG"
          "ListPrice" => array:3 [
            "Amount" => "19999"
            "CurrencyCode" => "GBP"
            "FormattedPrice" => "£199.99"
          ]
      ]
    ]
  ]
]

或者整个结果在这里：http://pastebin.com/TGFgCbAz

在我看来，我可以访问除 ListPrice 内的值以外的所有值，这会返回 "Undefined Index"

@foreach ($results['Items']['Item'] as $amazon)
 {{ $amazon['ItemAttributes']['Title'] }} //returns true with the value
 {{ $amazon['ItemAttributes']['ListPrice']['FormattedPrice'] }} //returns Undefined index: ListPrice
@endforeach

我在控制器端尝试了同样的事情：

foreach ($amazon_results['Items']['Item'] as $amazon) {
        print_r($amazon['ItemAttributes']['ListPrice']['FormattedPrice']);
    }

这 returns FormattedPrice 的值首先抛出相同的错误。

£199.99£34.99£194.50 Whoops, looks like something went wrong.

1/1 ErrorException in HomeController.php line 24: Undefined index: ListPrice

为什么我无法获得这个值？

Answer 1

讨厌成为坏消息的传递者，但只是没有 ListPrice 数组包含所有项目。您提供的完整转储有十项。其中两个（索引 7 和索引 9）不包含 ListPrice 数组。我建议先检查以确保它存在：

@foreach ($results['Items']['Item'] as $amazon)
 {{ $amazon['ItemAttributes']['Title'] }}
 @if (array_key_exists('ListPrice', $amazon['ItemAttributes']))
  {{ $amazon['ItemAttributes']['ListPrice']['FormattedPrice'] }}
 @else
  No list price
 @endif
@endforeach

JSON 解码、解析 JSON 响应和整数值的未定义索引

JSON decode, Parse JSON response and Undefined Index on integer value

php

arrays

json

laravel

amazon-product-api