在 Json（嵌套数组）PHP 中搜索键

Question

我使用 WU api 来获取一些每小时的天气数据。 API returns 具有多个小时值的 Json 我想查询我需要的那个：

Json:

{
  "response": {
  "version":"0.1",
  "termsofService":"http://www.wunderground.com/weather/api/d/terms.html",
  "features": {
  "hourly": 1
  }
    }
        ,
    "hourly_forecast": [
        {
        "FCTTIME": {
        "hour": "13","hour_padded": "13","min": "00","min_unpadded": "0","sec": "0","year": "2015","mon": "12","mon_padded": "12","mon_abbrev": "Dec","mday": "30","mday_padded": "30","yday": "363","isdst": "0","epoch": "1451509200","pretty": "1:00 PM PST on December 30, 2015","civil": "1:00 PM","month_name": "December","month_name_abbrev": "Dec","weekday_name": "Wednesday","weekday_name_night": "Wednesday Night","weekday_name_abbrev": "Wed","weekday_name_unlang": "Wednesday","weekday_name_night_unlang": "Wednesday Night","ampm": "PM","tz": "","age": "","UTCDATE": ""
        },
        "temp": {"english": "60", "metric": "16"},
        "dewpoint": {"english": "34", "metric": "1"},
        "condition": "Clear",
        "icon": "clear"
        }
        ,
        {
        "FCTTIME": {
        ...
        }
        ,
        "FCTTIME": {
        ...
        },
        ... more FCTTIME
   ]
}

这是我获取 hourly_forecast 作为数组的代码：

$jsonRequest    = file_get_contents("weather.json");
$data           = json_decode($jsonRequest, true);

$array   = @$data['hourly_forecast'];

我需要为 "hour": "13" 获取 temp 和 condition。所以 PHP 会打印出如下内容： The weather is $condition with $temp degree.

Answer 1

您应该能够遍历一组每小时的预测，当您找到与您正在寻找的小时相匹配的预测时，从该预测中获取您想要的值，然后跳出循环。

foreach ($data['hourly_forecast'] as $forecast) {
    if ($forecast['FCTTIME']['hour'] == 13) {
        $condition = $forecast['condition'];
        $temp = $forecast['temp'];
        break;
    }
}

Answer 2

首先不要将对象转为数组，没有必要。

所以改变$data = json_decode($jsonRequest, true);

到$data = json_decode($jsonRequest);

然后遍历 $data->hourly_forecast 数组寻找你需要的特定时间，就像这样

foreach( $data->hourly_forecast as $forecast ) {
    if ( $forecast->FCTTIME->hour == 13 ) {
        echo 'The time  ' . $forecast->FCTTIME->hour.PHP_EOL;
        echo 'The temp F' . $forecast->temp->english.PHP_EOL;
        echo 'The temp C' . $forecast->temp->metric.PHP_EOL;
        echo 'The condition ' . $forecast->condition.PHP_EOL;

        // if this is all you need, stop looping
        break;
    }
}

在 Json（嵌套数组）PHP 中搜索键

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