PHP SimpleXML 命名空间问题

发布于 2024-11-07 20:30:22 字数 417 浏览 3 评论 0原文

我正在尝试获取 RSS 提要中每个条目的条目->id 和条目->cap:parameter->value....下面是我正在使用的代码。它正确显示 ID，但不显示值字段......请帮助。

$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>";
}

感谢您提前的帮助。

原文

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>";
}

Thanks for the help in advance.

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年少掌心 2024-11-14 20:30:22

元素不在同一个命名空间 as ：

<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()。

代码（演示）

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

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>

So you have to call children() again.

Code (demo)

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

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