class WeatherService{

	public function WeatherService(){
		//some initialization...
	}
	
	public function getWeatherInfo($city, $method=""){
		
		$res = shell_exec("./getWdr.sh {$city}");
		
		if ($methos=="CL")
			return convertFrToC($res);
			
		return $res;
	}
	
	public static function convertFrToC($val){
		return (($val+40)*5/9)-40;
	}
	

}


//now it can also be used independently of the rest of the WeatherService 
//functions and main purpose...

$c = WeatherService::convertFrToC(22);

Get Weather - Step 4 - Enhancing encapsulation

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