Classe para mostrar previsão do tempo.

Weather.php

<?php

/**
 * Class Weather
 *
 * An open source application
 *
 * @package		Weather
 * @category    Classes
 * @author		Ramon Barros
 * @copyright	Copyright (c) 2012, Ezoom Ltda.
 * @license		http://www.ramon-barros.com/
 * @link		http://public.ramon-barros.com/
 * @since		Version 0.6.12
 * @filesource  Weather.php
 */

class Weather {
	private $url;
	private $urlApi;
	private $city;
	private $state;
	private $country;
	private $language;
	private $dateformat;
	private $info;
	private $current;
	private $next;
	public $day_of_week;
	public $week;

	/**
	 * Constroi o objeto que representa o tempo e salva as configurações.
	 * @access	public
	 * @param   string $city 
	 * @param   string $state
	 * @param   string $country
	 * @param   string $language
	 */
	public function __construct($city='Caxias do Sul', $state='Rio Grande do Sul',$country='Brasil',$language='pt-br'){
		$this->city = $city;
		$this->state = $state;
		$this->country = $country;
		$this->language = $language;
		$this->dateformat = 'd/m/Y';
		$this->url = 'http://www.google.com/';
		$this->urlApi = rtrim($this->url,'/').'/ig/api';
	}

	/**
	 * Carrega o arquivo XML.
	 * @access	private
	 * @param   string $url 
	 * @throws  Exception
	 */
	private function getFile($url){
		try {
			$ch = curl_init();
			curl_setopt($ch, CURLOPT_URL, $url);
			curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
			curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);
			$output = curl_exec($ch);
			curl_close($ch);
			return $output;
		} catch (Exception $e) {
			throw new Exception("Error Processing Request".$e->getMessage(), 1);			
		}		
	}

	/**
	 * Remove acentos.
	 * @access	private
	 * @param   string $string 
	 * @return  string
	 */
	private function caracter($string){
		
		 $string = strtr($string,
		   "\xA1\xAA\xBA\xBF\xC0\xC1\xC2\xC3\xC5\xC7
		    \xC8\xC9\xCA\xCB\xCC\xCD\xCE\xCF\xD0\xD1
		    \xD2\xD3\xD4\xD5\xD8\xD9\xDA\xDB\xDD\xE0
		    \xE1\xE2\xE3\xE5\xE7\xE8\xE9\xEA\xEB\xEC
		    \xED\xEE\xEF\xF0\xF1\xF2\xF3\xF4\xF5\xF8
		    \xF9\xFA\xFB\xFD\xFF\x20\x2D",
		    "!ao?AAAAAC
		    EEEEIIIIDN
		    OOOOOUUUYa
		    aaaaceeeei
		    iiidnooooo
		    uuuyy__");  

		$string = strtr($string, array("\xC4"=>"Ae", "\xC6"=>"AE", "\xD6"=>"Oe", "\xDC"=>"Ue", "\xDE"=>"TH", "\xDF"=>"ss", "\xE4"=>"ae", "\xE6"=>"ae", "\xF6"=>"oe", "\xFC"=>"ue", "\xFE"=>"th"));

		return strtolower( $string );
	}

	/**
	 * Le o arquivo XML e salva as informações.
	 * @access	public
	 * @return  this
	 */
	public function temp(){
		
		if(!$this->info && !$this->current && !$this->next){
			$apiUrl = $this->urlApi.'?weather='.urlencode($this->city).','.urlencode($this->state).','.urlencode($this->country).'&hl='.$this->language;
			
			$xml = simplexml_load_string(
							utf8_encode(
								$this->getFile($apiUrl)
							)
						);
			$info = $xml->xpath('/xml_api_reply/weather/forecast_information');
			$current = $xml->xpath('/xml_api_reply/weather/current_conditions');
			$next = $xml->xpath('/xml_api_reply/weather/forecast_conditions');
		
			$this->info = $info[0];
			$this->current = $current[0];
			$this->next = $next;
		}
		return $this;
	}

	/**
	 * Retorna a data da consulta.
	 * @access	public
	 * @return  date
	 */
	public function getDate(){
		return date( $this->dateformat, strtotime($this->info->forecast_date['data']) );
	}

	/**
	 * Retorna o nome da cidade e estado.
	 * @access	public
	 * @return  date
	 */
	public function getCityName(){
		return $this->info->city['data'];
	}

	/**
	 * Retorna o icone do tempo atual.
	 * @access	public
	 * @return  string
	 */
	public function getCurrentTempIco(){
		return $this->current->icon['data'];
	}

	/**
	 * Retorna a url completa do icone do tempo atual.
	 * @access	public
	 * @return  string
	 */
	public function getCurrentTempUrlIco(){
		return rtrim($this->url,'/').'/'.$this->current->icon['data'];
	}

	/**
	 * Retorna a temperatura do dia atual.
	 * @access	public
	 * @return  string
	 */
	public function getCurrentTemp($temp='c'){
			switch($temp)
			{
				case 'f':
					return $this->current->temp_f['data'];
				break;
				case 'c':
				default:
					return $this->current->temp_c['data'];
				break;
			}
	}

	/**
	 * Retorna a condição do tempo do dia atual
	 * @access	public
	 * @return  string
	 */
	public function getCurrentCondition(){
		return $this->current->condition['data'];
	}

	/**
	 * Carrega as informações do tempo dos próximos dias.
	 * @access	public
	 * @return  this
	 */
	public function getNextTemp(){
		$this->day_of_week = $this->nextTempToArray();
		return $this;
	}

	/*
	private function nextTempToArray(){
		//$next = array();
		foreach ($this->next as $temp) {
			$key = $this->caracter(utf8_decode($temp->day_of_week['data']));
			$this->week[] = $key;

			$next->{$key}->week = utf8_decode($temp->day_of_week['data']);
			$next->{$key}->low = $temp->low['data'];
			$next->{$key}->high = $temp->high['data'];
			$next->{$key}->icon = rtrim($this->url,'/').'/'.$temp->icon['data'];
			$next->{$key}->condition = $temp->condition['data'];
		}
		return $next;
	}
	*/

	/**
	 * Cria o array com as informações do tempo dos próximos dias.
	 * @access	private
	 * @return  this
	 */
	private function nextTempToArray(){
		//$next = array();
		foreach ($this->next as $temp) {
			$key = $this->caracter(utf8_decode($temp->day_of_week['data']));
			$this->week[] = $key;

			$next[$key]->week = utf8_decode($temp->day_of_week['data']);
			$next[$key]->low = $temp->low['data'];
			$next[$key]->high = $temp->high['data'];
			$next[$key]->icon = rtrim($this->url,'/').'/'.$temp->icon['data'];
			$next[$key]->condition = $temp->condition['data'];
		}
		return $next;
	}
}

$tempo = new Weather();

?>


<h2>Previsão do Tempo - <?php echo $tempo->temp()->getDate(); ?></h2>
<p>Cidade: <?php echo $tempo->getCityName(); ?></p>

<h3>Previsão Atual</h3>
<table>
	<tr>
		<td><img src="<?php echo $tempo->getCurrentTempUrlIco(); ?>" alt="weather" /></td>
		<td><?php echo $tempo->getCurrentTemp(); ?>&deg; C<br /><?php echo $tempo->getCurrentCondition(); ?></td>
	</tr>
</table>

<h3>Próximos dias</h3>
<table>
	<?php

		foreach ($tempo->getNextTemp()->day_of_week as $temp) {
		?>
			<tr>
				<td><?php  echo $temp->week; ?></td>
				<td><img src="<?php echo $temp->icon; ?>" alt="weather" /></td>
				<td><?php echo $temp->low; ?>/<?php echo $temp->high; ?>&deg; C<br /><?php echo $temp->condition; ?></td>
			</tr>
	<?
		}
	?>
</table>