PHP XML解析，多重'索引'問題

Question

我使用PHP foreach循環解析下面的數據，我需要從measuredValue索引2和索引3中提取數據，但是我不確定如何執行此操作。下面的代碼顯示了我用來從XML文件中提取數據的內容。我需要在'索引1'中進行溫度工作，但我無法弄清楚如何進入下一個'索引'部分。

foreach ($weather_array->payloadPublication->siteMeasurements as $roaddt){ 

    echo (" 
     <tr> 
      <td> " .$roaddt->measurementSiteReference. "</td> 
      <td> " .$roaddt->measurementTimeDefault. "</td> 
      <td> " .$roaddt->measuredValue->basicDataValue->temperature->airTemperature. "</td> 
      <td> " .$roaddt->measuredValue->basicDataValue->wind->windDirectionCompass. "</td> 
     </tr> "); 
} 
echo "</table>"; 

下面的代碼是什麼，我想從拉部分：

<siteMeasurements> 
    <measurementSiteReference>NRA10810</measurementSiteReference> 
    <measurementTimeDefault>2017-02-28T15:50:00+00:00</measurementTimeDefault> 
    <measuredValue index="1"> 
    <basicDataValue xsi:type="TemperatureInformation"> 
    <period>3600</period> 
    <temperature>...</temperature> 
    </basicDataValue> 
    </measuredValue> 
    <measuredValue index="2"> 
    <basicDataValue xsi:type="PrecipitationInformation"> 
    <period>3600</period> 
    <precipitationDetail></precipitationDetail> 
    </basicDataValue> 
    </measuredValue> 
    <measuredValue index="3"> 
    <basicDataValue xsi:type="WindInformation"> 
    <period>3600</period> 
    <wind> 
    <maximumWindSpeed>45</maximumWindSpeed> 
    <windDirectionBearing>302</windDirectionBearing> 
    <windDirectionCompass>westNorthWest</windDirectionCompass> 
    <windSpeed>27.4</windSpeed> 
    </wind> 
    </basicDataValue> 
    </measuredValue> 

Answer 1

你只環路上siteMeasurements，但每個siteMeasurements有多個measuredValue。
因此，在您現有的循環中，您需要在measuredValue上添加另一個循環。類似的東西：

foreach ($weather_array->payloadPublication->siteMeasurements as $roaddt){ 
    echo (" 
     <tr> 
      <td> " .$roaddt->measurementSiteReference. "</td> 
      <td> " .$roaddt->measurementTimeDefault. "</td>"); 
    foreach ($roaddt->measuredValue as $mValue){ 
    echo ("<td> " .$mValue->basicDataValue. "</td>");    
    } 
    echo ("</tr>"); 
}