从ECB货币XML对象提取数据

Question

我正在尝试从ECB货币XML对象提取交换值。 可在此处http://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml

我可以毫无问题地加载对象，并且print_r向我显示所有数据。 但是，我无法从此对象获取特定数据。

$xml_url = "http://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml";

if (($response_xml_data = file_get_contents($xml_url))===false){
    echo "Error fetching XML\n";
} else {
   libxml_use_internal_errors(true);
   $data = simplexml_load_string($response_xml_data);
   if (!$data) {
       echo "Error loading XML\n";
       foreach(libxml_get_errors() as $error) {
           echo "\t", $error->message;
       }
   } else {
        echo 'type is: '.gettype($data).'<br>';
        echo $data->propertyArray;
        //echo $data->asXML();
        print_r($data);

    }
}

这是print_r的输出

SimpleXMLElement对象（[Cube] => SimpleXMLElement对象（[Cube] => SimpleXMLElement对象（[@attributes] => Array（[time] => 2018-03-09）[Cube] => Array（[0] => SimpleXMLElement对象（[@attributes] =>数组（[currency] => USD [rate] => 1.2291））[1] => SimpleXMLElement Object（[@attributes] => Array（[currency] => JPY [rate] => 131.31））[2] => SimpleXMLElement对象（[@attributes] =>数组（[currency] => BGN [rate] => 1.9558））[3] => SimpleXMLElement对象（[@attributes] => Array （[currency] => CZK [rate] => 25.454））[4] => SimpleXMLElement对象（[@attributes] => Array（[currency] => DKK [rate] => 7.4494））[5] => SimpleXMLElement对象（[@attributes] =>数组（[currency] => GBP [rate] => 0.88893））[6] => SimpleXMLElement Object（[@attributes] => Array（[currency] => HUF [rate] => 311.93））[7] => SimpleXMLElement对象（[@attributes] =>数组（[currency] => PLN [rate] => 4.2018））[8] => SimpleXMLElement对象（[@attributes] => Array （[ currency] => RON [rate] => 4.6570））[9] => SimpleXMLElement对象（[@attributes] =>数组（[currency] => SEK [rate] => 10.1648））[10] => SimpleXMLElement对象（[@attributes] =>数组（[currency] => CHF [rate] => 1.1695））[11] => SimpleXMLElement对象（[@attributes] => Array（[currency] => ISK [rate] => 122.90））[12] => SimpleXMLElement对象（[@attributes] =>数组（[currency] => NOK [rate] => 9.5948））[13] => SimpleXMLElement对象（[@attributes] => Array（[ currency] => HRK [rate] => 7.4355））[14] => SimpleXMLElement对象（[@attributes] => Array（[currency] => RUB [rate] => 70.1112））[15] => SimpleXMLElement对象（[@attributes] =>数组（[currency] => TRY [rate] => 4.6939））[16] => SimpleXMLElement对象（[@attributes] => Array（[currency] => AUD [rate] => 1.5772））[17] => SimpleXMLElement对象（[@attributes] =>数组（[currency] => BRL [rate] => 4.0100））[18] => SimpleXMLElement对象（[@attributes] => Array（[货币] => CAD [r ate] => 1.5848））[19] => SimpleXMLElement对象（[@attributes] =>数组（[currency] => CNY [rate] => 7.7895））[20] => SimpleXMLElement对象（[@attributes] = >数组（[currency] => HKD [rate] => 9.6370））[21] => SimpleXMLElement对象（[@attributes] => Array（[currency] => IDR [rate] => 16976.78））[22] => SimpleXMLElement对象（[@attributes] =>数组（[currency] => ILS [rate] => 4.2345））[23] => SimpleXMLElement对象（[@attributes] => Array（[currency] => INR [ rate] => 80.1315））[24] => SimpleXMLElement对象（[@attributes] =>数组（[currency] => KRW [rate] => 1315.51））[25] => SimpleXMLElement对象（[@attributes] = >数组（[currency] => MXN [rate] => 22.8810））[26] => SimpleXMLElement对象（[@attributes] => Array（[currency] => MYR [rate] => 4.8105））[27] => SimpleXMLElement对象（[@attributes] =>数组（[currency] => NZD [rate] => 1.6931）））[28] => SimpleXMLElement对象（[@attributes] => Array（[currency] => PHP [率] => 64.102 ））[29] => SimpleXMLElement对象（[@attributes] =>数组（[currency] => SGD [rate] => 1.6204））[30] => SimpleXMLElement对象（[@attributes] => Array（[currency ] => THB [rate] => 38.538））[31] => SimpleXMLElement对象（[@attributes] => Array（[currency] => ZAR [rate] => 14.6257）））））））

我如何从美元中获取汇率的值？ 阅读此线程后， 如何访问数组/对象？ 我仍然不知道如何访问数据。

echo $data->propertyArray;

不返回任何东西。

Answer 1

您可以遍历对象并检查每种类型的货币。

$xml_url = "http://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml";
if (($response_xml_data = file_get_contents($xml_url))===false){
    echo "Error fetching XML\n";
} else {
    libxml_use_internal_errors(true);
    $data = simplexml_load_string($response_xml_data);
    if (!$data) {
        echo "Error loading XML\n";
        foreach(libxml_get_errors() as $error) {
            echo "\t", $error->message;
        }
    } else {
        foreach($data->Cube->Cube->Cube as $currency) {
            if($currency['currency'] == 'USD') {
                echo $currency['rate'];
            }
        }
    }
}