从PHP中的JSON数组中获取价值 [英] Get value from JSON array in PHP

问题描述

我正在尝试从PHP变量中的以下JSON数组中获取值.

I'm trying to get the value from this following JSON array in a PHP variable.

这是数组的var_dump:

This is a var_dump of the array:

array(3) {
  ["id"]=>
  string(2) "14"
  ["css"]=>
  string(400) ""
  ["json"]=>
  string(4086) "
            {
                "Canvas": [
                    {
                        "MainObjects": {
                            "After Participation": {
                                "afterParticipationHeader": "Thank you!"
                            },
                            "Invite Friends": {
                                "InviteHeadline": "",
                                "InviteMsg": "",
                                "InviteImg": ""
                            }
                        },
                        "QuizModule": {
                            "Questions": [],
                            "Submit_Fields": [
                                {
                                    "label": "Name",
                                    "name": "txtName",
                                    "value": true
                                }
                            ]
                        }
                    }
                ]
            }"
        }

我能够像这样在PHP中获取["json"]的值:

I am able to get the values for ["json"] in PHP like:

$json = $data[0]['json'];

但是如何从"json"内部的数组中获取值，例如"AfterParticipationHeader".还有"Submit_Fields"?

But how do I get the value from from the array inside "json", like "AfterParticipationHeader". And "Submit_Fields" ?

推荐答案

首先，您必须解码json数据

First you have to decode your json data

$json = json_decode($data[0]['json']);

然后您可以访问您的AfterParticipationHeader

$json->Canvas[0]->MainObjects->{"After Participation"}->afterParticipationHeader

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