Yahoo-Weather-API.php

<?php

//assumes file already downloaded!
$local_file='feed.xml';

$result = file_get_contents($local_file);
$xml = simplexml_load_string($result);

$xml->registerXPathNamespace('yweather', 'http://xml.weather.yahoo.com/ns/rss/1.0');
$location = $xml->channel->xpath('yweather:location');

//Should only be one location? Change if necessary..
//check ALL data that you're going to use
if(is_array($location)&&count($location)==1&&isset($location[0]['city'][0])) { 
	//original loop not needed, all forecast data stored in one array
	$forecast = $xml->channel->item->xpath('yweather:forecast');
	
	if(is_array($forecast)&&count($forecast)>0){ //check forecast data exists!
		$projection=array(); //always initialize your variables.
		
		foreach($forecast as $day) {
			$projection[] = array(
				'day' => (string)$day['day'],
				'low' => (int) round($day['low'],0), //round to int just to be sure
				'high' => (int) round($day['high'],0),
				'code' => (int) $day['code']
			);
		}
		
		$weather = array(
	  		'location' => $location[0]['city'][0],
	  		'forecast' => $projection
	  	);

		if(isset($_SERVER['argv'])){
			print_r($weather);
		}
		else{
			echo '<pre>'.print_r($weather,1).'</pre>';
		}
	}
	else{
		echo "Sorry, there was an error while loading this data. Never mind :\ ";	
	}
}
?>