多维数组上的json_encode()-带字符串键 [英] json_encode() on a multidimensional array - with string keys

问题描述

我正在使用PHP创建一个非常大的多维数组.每个对象都包含名称，ID，ParentID和子级.子级是由更多相同格式的对象组成的数组.

I am creating an very large multidimensional array using PHP. Each object contains Name, ID, ParentID and Children. Children is an array of more objects in the same format.

至关重要的是，我要命名每个对象的ID-这有助于我将每个对象放在正确的父对象下. (在下面的代码中，我使用101、102等.)

It is critical I name the IDs of each object - this helps me put each object under the correct parent. (In the code below, I use 101, 102 etc.)

但是，我遇到的问题是当我使用json_encode返回JSON中的数组时.每个儿童"数组都将被打印为对象，而不是数组-如下面的JSON代码所示.

However, the problem I am having is when I return the array in JSON using json_encode. Each 'Children' array is being printed as an object, not an array - as shown in the JSON code below.

我在此处上读到另一个SO线程时，它们由于包含字符串键而成为对象" -尽管它们是数字，但它们仍然是字符串.

As I read on another SO thread here, they "are made as objects because of the inclusion of string keys" - although they are numbers, they are still strings.

{
"101": {
    "ID": "101",
    "ParentID": "0",
    "Name": "Root One"
    "Children": {
        "102": {
            "ID": "102",
            "ParentID": "101",
            "Name": "Child One"
        },
        "103": {
            "ID": "103",
            "ParentID": "101",
            "Name": "Child Two",
            "Children": {
                "104": {
                    "ID": "104",
                    "ParentID": "103",
                    "Name": "Child Child One"
                }
            }
        },

有人知道如何克服这个问题吗?

Does anyone know how to overcome this issue?

JSON应该看起来像这样(方括号很重要！):

The JSON should look like this (the square brackets are important!):

[
{
    "ID": "101",
    "ParentID": "0",
    "Name": "Root One",
    "Children": [
        {
            "ID": "102",
            "ParentID": "101",
            "Name": "Child One",
            "Children": [

推荐答案

我现在有了一个快速有效的可行解决方案.

I have now got a working solution which is fast and works well.

1. 首先，按照问题的SO链接编写；

1. Firstly, as written in SO link from the question;

在JSON中，数组仅具有数字键，而对象具有字符串 特性.包含数组键会强制整个外部 结构必然成为对象.

In JSON, arrays only have numeric keys, whereas objects have string properties. The inclusion of a array key forces the entire outer structure to be an object by necessity.

在JSON中；弯括号可容纳对象({})，方括号可容纳数组([]).

In JSON; Curly braces hold objects ({}), Square brackets hold arrays ([]).

因此，使用字符串作为键将导致json_encode函数返回对象，而重置键将确保其创建数组.

So using a string as a key will result in the json_encode function returning objects, whereas reseting the keys will ensure it creates arrays.

因此，在返回JSON编码的字符串之前，我运行了一个函数来重置所有数组键.我在此SO线程(在多维数组中重置数组键)中找到的代码特别有用！

Therefore, just before I return my JSON encoded string, I run a function to reset all the array keys. The code I found on this SO thread (Reset array keys in multidimensional array) was particularly useful!

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