Php 如何在json文件中插入新字段

我有一个像这样的JSON文件

{
    "AAL": {
        "id": "32313",
        "airport_name": "Aalborg",
        "latitude": "57.1",
        "longitude": "9.85",
        "timezone": "2",
        "dst_indicator": "E",
        "city": "Aalborg",
        "country": "Denmark",
        "country_code": "DK",
        "region": "TC1",
        "listing_display": "true",
        "pseudonyms": ""
    },
    "AAR": {
        "id": "32314",
        "airport_name": "Tirstrup",
        "latitude": "56.15",
        "longitude": "10.2167",
        "timezone": "2",
        "dst_indicator": "E",
        "city": "Aarhus",
        "country": "Denmark",
        "country_code": "DK",
        "region": "TC1",
        "listing_display": "true",
        "pseudonyms": ""
    }
}

我需要向它添加一个新字段，并使用php获得如下结果。任何帮助都将不胜感激

{
    "AAL": {
        "station_code":"AAL",
        "id": "32313",
        "airport_name": "Aalborg",
        "latitude": "57.1",
        "longitude": "9.85",
        "timezone": "2",
        "dst_indicator": "E",
        "city": "Aalborg",
        "country": "Denmark",
        "country_code": "DK",
        "region": "TC1",
        "listing_display": "true",
        "pseudonyms": ""
    },
    "AAR": {
        "station_code":"AAR",
        "id": "32314",
        "airport_name": "Tirstrup",
        "latitude": "56.15",
        "longitude": "10.2167",
        "timezone": "2",
        "dst_indicator": "E",
        "city": "Aarhus",
        "country": "Denmark",
        "country_code": "DK",
        "region": "TC1",
        "listing_display": "true",
        "pseudonyms": ""
    }
}

---

您应该将json解析为php变量。这里添加额外字段并将其解析回json

---

您可以通过这种方式实现输出

$data= '{
    "AAL": {
        "id": "32313",
        "airport_name": "Aalborg",
        "latitude": "57.1",
        "longitude": "9.85",
        "timezone": "2",
        "dst_indicator": "E",
        "city": "Aalborg",
        "country": "Denmark",
        "country_code": "DK",
        "region": "TC1",
        "listing_display": "true",
        "pseudonyms": ""
    },
    "AAR": {
        "id": "32314",
        "airport_name": "Tirstrup",
        "latitude": "56.15",
        "longitude": "10.2167",
        "timezone": "2",
        "dst_indicator": "E",
        "city": "Aarhus",
        "country": "Denmark",
        "country_code": "DK",
        "region": "TC1",
        "listing_display": "true",
        "pseudonyms": ""
    }
}';

$arrData  =  json_decode($data,true);
foreach($arrData as $key=>$val){
    $arrData[$key]['station_code']=$key;
}

echo json_encode($arrData);
exit;

PHP中的JSON解析 要读取包含JSON数据的文件，请执行以下操作：

$json_array_assc = json_decode(file_get_contents($file_name), true);

要向数组中添加字段，可以执行以下操作：

$json_array_assc["NEWDATA"]=array('newdata1'=>'foo1','newdata2'=>'foo2');

要将新数据写入文件，请使用：

file_put_contents($file_name, json_encode($json_array_assc));

或者只需在控制台窗口上打印阵列：

echo "<pre>";
print_r($json_array_assc);

仔细阅读并阅读。

echo json_encode($json_array_assc);