打印嵌套的JSON数组值

Question

我一直在试图找到打印个人数据的方法，但似乎找不出我哪里出了问题。

我从这个开始，但没有结果。在此之前，我尝试过嵌套循环，但也一无所获。

$data = curl_exec($ch);
$d = json_decode($data, true);
foreach($d as $k=>$v){
echo $v['value']['displayName'];
}

然后我试了一下，只得到了一些结果。我不知道我这是怎么回事。

foreach(json_decode($data,true) as $d){
 foreach($d as $k=>$v){
  foreach($v as $kk=>$vv){
   echo $kk.$vv;
   }
  }
}

JSON看起来如下所示：

{
  "value": [
    {
      "id": "",
      "name": "",
      "etag": "",
      "type": "Microsoft.SecurityInsights/alertRules",
      "kind": "Scheduled",
      "properties": {
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": false,
            "reopenClosedIncident": false,
            "lookbackDuration": "PT5M",
            "matchingMethod": "AllEntities",
            "groupByEntities": [],
            "groupByAlertDetails": null,
            "groupByCustomDetails": null
          }
        },
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "AccountCustomEntity"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPCustomEntity"
              }
            ]
          }
        ],
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "severity": "Medium",
        "query": "",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Reconnaissance",
          "Discovery"
        ],
        "displayName": "MFA disabled for a user",
        "enabled": true,
        "description": "Multi-Factor Authentication (MFA) helps prevent credential compromise. This alert identifies when an attempt has been made to diable MFA for a user ",
        "alertRuleTemplateName": null,
        "lastModifiedUtc": "2022-11-14T02:20:28.8027697Z"
      }
    },
...
...
...

Answer 1

下面是如何在不需要循环的情况下获得显示名称。注意，0是数组的键值，因为它没有名称。

我们从value开始，通过选择第一个数组0，将一个层移动得更深。现在我们需要选择properties，最后，我们可以从那里得到displayName。

$displayName = $d["value"][0]["properties"]["displayName"];
echo($displayName);

/*
Here is a quick demonstration:

value:
{
    0:
    {
        ...
        properties:
        {
            ...
            displayName: [We made it!]
        }
    }

}

*/

这里有一篇很好的文章，详细地解释了这一点

How to decode multi-layers nested JSON String and display in PHP?