XML RSS Feed Parse PHP

With an XML feed like so:

<w:current temperature="22.2" dewPoint="12.9" humidity="56" windSpeed="5.6" windGusts="9.3" windDirection="ESE" pressure="1017.8" rain="0.0" />

and

<w:forecast day="Thursday" description="Mostly Sunny. Warm." min="17" max="29" icon="2" iconUri="http://www.weather.com.au/images/icons/2.gif" iconAlt="Mostly Sunny" />

How do I parse it in PHP using the dom?

$doc = new DOMDocument();
$doc->load('http://rss.weather.com.au/sa/adelaide');
$arrFeeds = array();
foreach ($doc->getElementsByTagName('item') as $node) {
    $itemRSS = array ( 
      开发者_运维百科  'title' => $node->getElementsByTagName('title')->item(0)->nodeValue,
        'description' => $node->getElementsByTagName('w')->item(0)->nodeValue,
        );
    array_push($arrFeeds, $itemRSS);
}

Returns error :Notice: Trying to get property of non-object in /var/www/index.php on line 123

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I'd personally use SimpleXML for this, you just have to bear in mind the custom namespace which is being used to carry the weather data, here's a little example (with no error handling etc) which I've just tested and fetches the current weather.

//Fetch the feed
$feed = file_get_contents("http://rss.weather.com.au/sa/adelaide");
//Load it into simplexml
$weather = simplexml_load_string($feed);
//Get namespace descendants using the w namespace defined in the feed
$channelelements = $weather->channel->item->children("http://rss.weather.com.au/w.dtd");
//Looping through each of the attributes and echoing them, you can do what you want with them at this point
foreach($channelelements->attributes() as $k => $attr) {
    echo $k.' = '.$attr.'<br />';
}

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Look to DOMDocument::getElementByTagNameNS and you will probably also want DOMNode::lookupNamespaceURI to work with the prefix (e.g. w) rather than the namespace URI (e.g. http://rss.weather.com.au/w.dtd).