PHP SimpleXML 命名空间问题 [英] PHP SimpleXML Namespace Problem

问题描述

我正在尝试获取 RSS 源中每个条目的 entry->id 和 entry->cap:parameter->value.... 下面是我正在使用的代码.它正确显示了 id 但它没有显示值字段....请帮忙.

I'm trying to get the entry->id and entry->cap:parameter->value for every entry in the RSS feed.... below is the code I'm using. It is displaying the id correctly however it is not displaying the value field.... please help.

$url = 'http://alerts.weather.gov/cap/us.php?x=1';
$cap = simplexml_load_file($url);
foreach($cap->entry as $entry){
    echo 'ID: ', $entry->id, "
";
    echo 'VTEC: ', $entry->children('cap', true)->parameter->value, "
"; 
echo "<hr>";
}

提前感谢您的帮助.

推荐答案

元素不在同一个 namespace 作为 :

The <value> element is not in the same namespace as <cap:parameter>:

<cap:parameter>
    <valueName>VTEC</valueName>
    <value>/O.CON.KMPX.FL.W.0012.000000T0000Z-110517T1800Z/</value>
</cap:parameter>

所以你必须再次调用children().

$feed = simplexml_load_file('http://alerts.weather.gov/cap/us.php?x=1');
foreach ($feed->entry as $entry){
    printf(
        "ID: %s
VTEC: %s
<hr>",
        $entry->id,
        $entry->children('cap', true)->parameter->children()->value
    );
}

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