How to parse this NOAA Weather Alert CAP in PHP?

Greetings,

I am having some difficulty understanding how to parse NOAA's Weather Alert CAP in PHP. I need to do the following:

• Locate the proper county in the feed
• Verify that there is an active alert
• Display the alert's description

The feed I am working with is at this address - h开发者_如何学Pythonttp://www.weather.gov/alerts/va.cap I have used simplexml_load_string() in the past for this sort of thing but it does not seem to work for this feed.

Thanks!

After some more time on Google I came across a script that does exactly what I am trying to do. Rather than try to reinvent the wheel, I am going to go with it. http://saratoga-weather.org/scripts-atom.php#atomadvisory

You are probably having an issue due to the namespace

<cap:alert xmlns:cap='http://www.incident.com/cap/1.0'>

This should give you an idea of how to extract information

$sxe = simplexml_load_file('http://www.weather.gov/alerts/va.cap');
foreach ($sxe->getDocNamespaces() as $ns => $uri) {
    $sxe->registerXPathNamespace($ns, $uri);
}
foreach($sxe->xpath('//cap:areaDesc') as $areaDesc) {
    echo $areaDesc;
}

On a sidenote, SimpleXml is for simple XML only. Consider using DOM instead.