PHP JSON解码:带有"$"问题的数组 [英] PHP JSON decode: array with '$' problem

问题描述

我将以下JSON文件作为输入

I have the following JSON file as input,

{
  "$type": "NanoWebInterpreter.WebInputData, NanoWebInterpreter",
  "NBBList": {
    "$type": "System.Collections.Generic.List`1[[monoTNP.Common.NBB, monoTNP.Common]], mscorlib",
    "$values": [
      {
        "$type": "monoTNP.Common.NBB, monoTNP.Common",
        "ID": "id-0065-00000003",
        "MPList": {
          "$type": "System.Collections.Generic.List`1[[monoTNP.Common.MP, monoTNP.Common]], mscorlib",
          "$values": [
            {
              "$type": "monoTNP.Common.EllipticalMP, monoTNP.Common",
              "Eccentricity": 1.0,
              "ID": "id-0065-00000006",
              "ParticleIndex": -1,
              "DispersionInteractionStrength": 0.0,
              "DispersionInteractionRange": 2.5,
              "CharacteristicSize": 0.0,
              "CenterOfMass": "<0,0,0>",
              "OrientationVector": "<>"
            },
            {
              "$type": "monoTNP.Common.CubeMP, monoTNP.Common",
              "ID": "id-0065-00000005",
              "ParticleIndex": -1,
              "DispersionInteractionStrength": 0.0,
              "DispersionInteractionRange": 2.5,
              "CharacteristicSize": 0.0,
              "CenterOfMass": "<0,0,0>",
              "OrientationVector": "<>"
            },
            {
              "$type": "monoTNP.Common.CircularMP, monoTNP.Common",
              "ID": "id-0065-00000004",
              "ParticleIndex": -1,
              "DispersionInteractionStrength": 0.0,
              "DispersionInteractionRange": 2.5,
              "CharacteristicSize": 0.0,
              "CenterOfMass": "<0,0,0>",
              "OrientationVector": "<>"
            }
          ]
        },

等

我的最终目标是递归地跟踪这棵树，用<ul>标签包装每个键/对象名称，并以某种<form>结构包装"ParticleIndex"级别的属性，但是我不知道如何索引两个'$ values'数组.

My ultimate goal is to trace this tree recursively, wrapping each key/object name with <ul> tags, and the properties at the "ParticleIndex" level in some kind of <form> structure, but I can't figure out how to index into the two '$values' arrays.

这是我一直在学习如何访问每个元素(对象或数组)的代码:

This is the code that I have been manipulating to learn how each element(object or array) is accessed:

foreach ($json->NBBList->'$values'[0] as $key => $value){
    var_dump($key);
    echo "\n".var_dump($value);
    echo "\n\n\n";
}

这显然是行不通的，因为值的索引在字符串的外部，但是当它在字符串的内部时，PHP会将其解释为字符串的一部分.

This obviously doesn't work because the index of values is outside of the string, but when it is on the inside, PHP interprets it as part of the string.

我是否可以索引"$ values"数组的每个元素，并最终进入for循环?

Is there a way for me to index into each element of the '$values' array, and ultimately in a for loop?

我正在考虑使用JSON解码的"true"属性可能是一个更好的解决方案...

I'm thinking using the "true" property of JSON decode might be a better solution...

推荐答案

您可以使用以下表示法访问名称包含特殊字符的对象属性:

You can access object properties with names that contain special characters using this notation:

$json->NBBList->{'$values'}[0]

我认为此行为在任何地方都没有记录，但是您可以在 PHP语法(请参见variable_name的定义，该定义在object_dim_list中使用，在object_property中使用).

I don't think that this behavior is documented anywhere, but you can find it in the PHP grammar (see definition of variable_name, which is used in object_dim_list, which is used in object_property).

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