php数组学习(2):判断并过滤JSON字符串中不包含指定键名的解决方案

项目需求

1. 一组数据格式需要判断是否存在键名name,如果存在，则直接输出；如果不存在，直接过滤掉；
2. 使用array_key_exists函数；

数据格式

{
  "err": "",
  "res": "",
  "data": [
    {
      "name": "CVR06",
      "cpu": 13,
      "ddr": 61,
      "disk": 84,
      "wlan": 24,
      "storage": 0,
      "status": {
        "cpu": [
          "正常运行"
        ],
        "disk": "正常运行",
        "wlan": "正常运行",
        "ddr": [
          "正常运行"
        ],
        "storage": "正常运行"
      }
    },
    {
      "name": "CVR03",
      "cpu": 15,
      "ddr": 44,
      "disk": 77,
      "wlan": 43,
      "storage": 0,
      "status": {
        "wlan": "正常运行",
        "ddr": [
          "正常运行"
        ],
        "cpu": [
          "正常运行"
        ],
        "disk": "正常运行",
        "storage": "正常运行"
      }
    },
    {
      "name": "CVR04",
      "cpu": 14,
      "ddr": 45,
      "disk": 77,
      "wlan": 33,
      "storage": 0,
      "status": {
        "wlan": "正常运行",
        "ddr": [
          "正常运行"
        ],
        "cpu": [
          "正常运行"
        ],
        "disk": "正常运行",
        "storage": "正常运行"
      }
    },
    {
      "name": "CVR07",
      "cpu": 13,
      "ddr": 61,
      "disk": 84,
      "wlan": 30,
      "storage": 0,
      "status": {
        "cpu": [
          "正常运行"
        ],
        "disk": "正常运行",
        "wlan": "正常运行",
        "ddr": [
          "正常运行"
        ],
        "storage": "正常运行"
      }
    },
    {
      "name": "CVR08",
      "cpu": 11,
      "ddr": 56,
      "disk": 84,
      "wlan": 26,
      "storage": 0,
      "status": {
        "wlan": "正常运行",
        "disk": "正常运行",
        "cpu": [
          "正常运行"
        ],
        "ddr": [
          "正常运行"
        ],
        "storage": "正常运行"
      }
    },
    {
      "name": "CVR09",
      "cpu": 12,
      "ddr": 57,
      "disk": 84,
      "wlan": 26,
      "storage": 0,
      "status": {
        "wlan": "正常运行",
        "disk": "正常运行",
        "cpu": [
          "正常运行"
        ],
        "ddr": [
          "正常运行"
        ],
        "storage": "正常运行"
      }
    },
    {
      "cpu": 0,
      "ddr": 0,
      "disk": 0,
      "wlan": 0,
      "storage": 0,
      "status": {
        "cpu": "正常运行",
        "ddr": "正常运行",
        "disk": "正常运行",
        "wlan": "正常运行",
        "storage": "正常运行"
      }
    },
    {
      "cpu": 0,
      "ddr": 0,
      "disk": 0,
      "wlan": 0,
      "storage": 0,
      "status": {
        "cpu": "正常运行",
        "ddr": "正常运行",
        "disk": "正常运行",
        "wlan": "正常运行",
        "storage": "正常运行"
      }
    },
    {
      "cpu": 0,
      "ddr": 0,
      "disk": 0,
      "wlan": 0,
      "storage": 0,
      "status": {
        "cpu": "正常运行",
        "ddr": "正常运行",
        "disk": "正常运行",
        "wlan": "正常运行",
        "storage": "正常运行"
      }
    },
    {
      "cpu": 0,
      "ddr": 0,
      "disk": 0,
      "wlan": 0,
      "storage": 0,
      "status": {
        "cpu": "正常运行",
        "ddr": "正常运行",
        "disk": "正常运行",
        "wlan": "正常运行",
        "storage": "正常运行"
      }
    },
    {
      "cpu": 0,
      "ddr": 0,
      "disk": 0,
      "wlan": 0,
      "storage": 0,
      "status": {
        "cpu": "正常运行",
        "ddr": "正常运行",
        "disk": "正常运行",
        "wlan": "正常运行",
        "storage": "正常运行"
      }
    },
    {
      "cpu": 0,
      "ddr": 0,
      "disk": 0,
      "wlan": 0,
      "storage": 0,
      "status": {
        "cpu": "正常运行",
        "ddr": "正常运行",
        "disk": "正常运行",
        "wlan": "正常运行",
        "storage": "正常运行"
      }
    },
    {
      "name": "一卡通服务器",
      "cpu": 51,
      "ddr": 73,
      "disk": 19,
      "wlan": 0,
      "storage": 72,
      "status": {
        "cpu": [
          "正常运行"
        ],
        "disk": "正常运行",
        "storage": [
          "正常运行"
        ],
        "ddr": [
          "正常运行"
        ],
        "wlan": "正常运行"
      }
    }
  ]
}

解决方案

//读取JSON数据;
$data = file_get_contents("data.json");
//数组解码;
$arr = json_decode($data, true);
//判断并过滤数组
foreach ($arr["data"] AS $k => $v) {
    if (array_key_exists("name", $arr["data"][$k])) {
        echo $v["name"];
    }
}
//重新组建数组并输出;
$listArr = array();
foreach ($arr["data"] AS $k => $v) {
    if (array_key_exists("name", $arr["data"][$k])) {
        $listArr[] = $v;
    }
}

lockdatav Done !