我正在嘗試從此https://api.met.no/weatherapi/locationforecast/2.0/compact?lat=-16.516667&lon=-68.166667讀取 JSON$options = array( 'http'=>array( 'method'=>"GET", 'header'=>"Accept-language: en\r\n" . "User-Agent: Mozilla/5.0 (iPad; U; CPU OS 3_2 like Mac OS X; en-us) AppleWebKit/531.21.10 (KHTML, like Gecko) Version/4.0.4 Mobile/7B334b Safari/531.21.102011-10-16 20:23:10\r\n" // i.e. An iPad )); $context = stream_context_create($options);$data_url = "https://api.met.no/weatherapi/locationforecast/2.0/compact?lat=-16.516667&lon=-68.166667";$json = file_get_contents($data_url,false,$context);$data = new RecursiveIteratorIterator( new RecursiveArrayIterator(json_decode($json, TRUE)), RecursiveIteratorIterator::SELF_FIRST);foreach ($data as $key => $val) { if(is_array($val)) { echo "$key:\n<br>"; } else { echo "$key => $val\n<br>"; }}這工作正常，但我需要根據鍵選擇特定值，例如：foreach ($data as $key) { echo $key["properties"] ["timeseries"] ["0-x"] ["data"] ["instant"] ["details"];}但這當然對我不起作用。請問不知道怎么辦？謝謝
1 回答
精慕HU
TA貢獻1845條經驗 獲得超8個贊
查看原始 json 返回，您嘗試獲取的項目相當隱蔽，但您仍然可以輕松獲取它。數據返回示例：
{
"type": "Feature",
"geometry": {
...
},
"properties": {
"meta": {
...
},
"timeseries": [
{
"time": "2020-08-18T12:00:00Z",
"data": {
"instant": {
"details": {
"air_pressure_at_sea_level": 1018.4,
"air_temperature": 4.7,
"cloud_area_fraction": 92.2,
"relative_humidity": 59.3,
"wind_from_direction": 308.4,
"wind_speed": 3.8
}
},
...
您可以通過以下方式訪問該特定數據：
$json = file_get_contents($data_url,false,$context);
// This is all you need to turn json into a usable array
$data = json_decode($json,true);
// Loop on the nested timeseries group:
foreach($data['properties']['timeseries'] as $ts) {
// the time part of it
$time = $ts['time'];
// get at it direct
$var = $ts['data']['instant']['details']['air_temperature'];
// shorthand it if you wish:
$details = $ts['data']['instant']['details'];
$var = $details['air_temperature'];
// do whatever else you need to do with it
echo $var;
$array_of_temps[] = $var;
// etc ...
}
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