Codice PHP:
<?php
define('WEATHER_FILE', 'weather'); // prefix for caching, <zip>.xml
class weather {
var $data;
var $saved;
var $metric;
function getWeather($zip, $units='c')
{
// setup the units
$this->metric = (strtoupper($units) == 'C');
if($this->metric) {$units = array('temp' => 'C', 'distance' => 'km', 'measure' => 'mb', 'speed' => 'kph');}
else {$units = array('temp' => 'F', 'distance' => 'mi', 'measure' => 'in', 'speed' => 'mph');}
$pdir = array('steady', 'rising', 'falling');
$wdir = array('N', 'NE', 'E', 'SE', 'S', 'SW', 'W', 'NW', 'N');
// get the feed contents from file unless older than 1 hour
$file = WEATHER_FILE . '.' . $zip . '.xml';
if(!file_exists($file) || filemtime($file) < time() - 3600) {
$this->data = @file_get_contents('http://xml.weather.yahoo.com/forecastrss?p=' . $zip . '&u=' . $units['temp']);
$fp = @fopen($file, 'w');
@fwrite($fp, $this->data);
@fclose($fd);
}
else $this->data = @file_get_contents($file);
if(strlen($this->data) <= 0) return;
// get the units of the saved file
$this->saved = explode('"', $this->tag('yweather:units'));
$this->saved = (strtoupper($this->saved[1]) == 'C');
$return = array();
// get the location
$attr = explode('"', $this->tag('yweather:location'));
$return['location'] = $attr[1].', '.$attr[3].', '.$attr[5];
// get the wind data
$attr = explode('"', $this->tag('yweather:wind'));
$return['windchill'] = $this->convert($attr[1], 'temp').'°'.$units['temp'];
$return['wind'] = $this->convert($attr[5], 'speed').' '.$units['speed'].' '.$wdir[round($attr[3]/45)];
// get the atmosphere data
$attr = explode('"', $this->tag('yweather:atmosphere'));
$return['humidity'] = $attr[1].'%';
$return['visibility'] = ($this->convert($attr[3], 'distance') / 100).' '.$units['distance'];
$return['preasure'] = $this->convert($attr[5], 'measure').' '.$units['measure'].' '.$pdir[$attr[7]];
$attr = explode('"', $this->tag('yweather:astronomy'));
$return['sunrise'] = $attr[1];
$return['sunset'] = $attr[3];
// get the temperature data
$attr = explode('"', $this->tag('yweather:condition'));
$return['text'] = $attr[1];
$return['temp'] = $this->convert($attr[5], 'temp').'°'.$units['temp'];
$return['image'] = IMAGES.$this->translate($attr[3], 'temp').'.png';
// get the two forecasts
$return['forecast'] = array();
for($i = 0; $i < 2; $i++) {
$attr = explode('"', $this->tag('yweather:forecast',$i));
if(count($attr) > 1) {
$day = array();
$day['when'] = $attr[1];
$day['low'] = $this->convert($attr[5], 'temp').'°'.$units['temp'];
$day['high'] = $this->convert($attr[7], 'temp').'°'.$units['temp'];
$day['text'] = $attr[9];
$day['image'] = IMAGES.$this->translate($attr[11]).'.png';
array_push($return['forecast'], $day);
}
}
return $return;
}
function tag($tag, $skip=0) {
$start = -1;
for($i = 0; $i <= $skip; $i++)
$start = strpos($this->data, "<{$tag}", $start + 1);
if($start === false) return false;
$start += strlen($tag) + 1;
$end = strpos($this->data, "</{$tag}>", $start);
if($end === false)
$end = strpos($this->data, '/>', $start);
return trim(substr($this->data, $start, $end - $start));
}
function convert($value, $type) {
switch($type) {
case 'temp': // Celsius or Farenheit
if($this->saved == $this->metric) return $value;
if($this->saved) return number_format($value * 1.8 + 32, 0);
return number_format(($value - 32) / 1.8, 0);
case 'speed': // kilometers per hour or miles per hour
case 'distance': // kilometers or miles
if($this->saved == $this->metric) return $value;
if($this->saved) return number_format($value * 0.621371192, 0);
return number_format($value * 1.609344, 0);
case 'measure': // millibars or inches
if($this->saved == $this->metric) return $value;
if($this->saved) return number_format($value * 0.0295301, 2);
return number_format($value * 33.8637526, 0);
}
}
function translate($code) {
$time = date('G');
$night = ($time <= 5 || $time >= 20); // night is between 8 pm and 6 am
switch($code) {
case 0: //tornado
case 3: //severe thunderstorms
case 4: //thunderstorms
case 37: //isolated thunderstorms
case 38: //scattered thunderstorms
case 39: return "ThunderStorm"; //scattered thunderstorms
case 1: //tropical storm
case 2: return "WindyRain"; //hurricane
case 5: //mixed rain and snow
case 16: //snow
case 41: //heavy snow
case 42: //scattered snow showers
case 43: return "Snow"; //heavy snow
case 6: //mixed rain and sleet
case 17: //hail
case 18: return "Sleet"; //sleet
case 7: return "IcyFrozenSnow"; //mixed snow and sleet
case 8: return "IcyDrizzle"; //freezing drizzle
case 9: return "Drizzle"; //drizzle
case 10: //freezing rain
case 35: return "IcyRain"; //mixed rain and hail
case 11: //showers
case 12: //showers
case 40: return "Showers"; //scattered showers
case 13: return "LightSnow";
case 14: return "MedSnow";
case 15: return "WindySnow";
case 19: return "Dust";
case 20: return "Fog";
case 21: return "Haze";
case 22: return "Smoke";
case 23:
case 24: return "Wind";
//case 25: return "Frigid"; //doesn't exist
case 26: return "Clouds";
case 27: return "MostlyCloudyNight";
case 28: return "MostlyCloudyDay";
case 29: return "PartlyCloudyNight";
case 30: return "PartlyCloudyDay";
case 31: return "Moon";
case 32: return "Sun";
case 33: return "FairNight";
case 34: return "FairDay";
case 36: return "Hot";
case 44:
if($night) return "PartlyCloudyNight";
else return "PartlyCloudyDay";
case 45:
case 47:
if($night) return "NightThunderStorm";
else return "SunnyThunderStorm";
case 46:
if($night) return "NightSnow";
else return "Snow";
default: return "Unknown";
}
}
}
?>
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