how to parse xml with php - php

Question

I am trying to read a weather feed from Yahoo to my site.
Using the code below I was able to print the xml.
What I really want to achieve now is to put the temperature and image in two different variables
$zipCode = "44418";
$url = "http://weather.yahooapis.com/forecastrss";
$zip = "?w=$zipCode";
$fullUrl = $url . $zip.'&u=c';
$curlObject = curl_init();
curl_setopt($curlObject,CURLOPT_URL,$fullUrl);
curl_setopt($curlObject,CURLOPT_HEADER,false);
curl_setopt($curlObject,CURLOPT_RETURNTRANSFER,true);
$returnYahooWeather = curl_exec($curlObject);
curl_close($curlObject);
print "yahooWeather". $returnYahooWeather;
//$temperature
//$image

Answer 1

You should go ahead and use simplexml or DOM to parse the XML and then you can iterate over the results. With SimpleXML this looks like this:
$zipCode = "44418";
$url = "http://weather.yahooapis.com/forecastrss";
$zip = "?w=$zipCode";
$fullUrl = $url . $zip.'&u=c';
$curlObject = curl_init();
curl_setopt($curlObject,CURLOPT_URL,$fullUrl);
curl_setopt($curlObject,CURLOPT_HEADER,false);
curl_setopt($curlObject,CURLOPT_RETURNTRANSFER,true);
$returnYahooWeather = curl_exec($curlObject);
curl_close($curlObject);
//print "here". $returnYahooWeather;
$xmlobj=simplexml_load_string($returnYahooWeather);
$res = $xmlobj->xpath("//yweather:condition");
$tmp = false;
while(list( , $node) = each($res)) {
$tmp = $node;
}
$attribs = $tmp->attributes();
print "Temperature [".$attribs['temp']."]";

Answer 2

I find it easiest to SimpleXML with PHP.
$xml = simplexml_load_string($returnYahooWeather);
echo $xml->Path->To->Temperature;
It's easy enough, and you can use XPath with SimpleXML :). There are other ways of parsing XML too, as previously mentioned DOMDocument is one of them.