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提要中每个条目的entry-> id和entry-> cap:parameter-> value....以下是我正在使用的代码.它正确显示了ID，但未显示值字段....请帮助.

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, "\n";
    echo 'VTEC: ', $entry->children('cap', true)->parameter->value, "\n"; 
echo "<hr>";
}

非常感谢您的帮助.

推荐答案

<value>元素不在同一命名空间作为<cap:parameter>:

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

所以您必须再次致电children().

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

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