Yahoo weather YQL API without authentication / No OAuth required - PHP script

yahoo_weather.php

<?php
class Yahoo_Weather
{
	protected $base_url = "http://query.yahooapis.com/v1/public/yql";
	protected $location = false;
	protected $units 	= false;
	protected $current 	= false;
	protected $future 	= false;
	protected $data 	= false;

	public function __construct($location)
	{
		if($location != "")
		{
			$this->location = $location;
			$this->getWeather();
		}
	}
	private function getWeather()
	{
		if($this->location)
		{
			$yql_query 	= 'select * from weather.forecast where woeid in (select woeid from geo.places(1) where text="'.$this->location.'")';

			$yql_query_url 	= $this->base_url . "?q=" . urlencode($yql_query) . "&format=json";
			$curl 			= curl_init($yql_query_url);
			curl_setopt($curl, CURLOPT_RETURNTRANSFER,true);
			$json 			= curl_exec($curl);
			$data 			= json_decode($json);

			$this->data		= $data->query;
			$this->units	= $data->query->results->channel->units;
			$this->current	= $data->query->results->channel->item->condition;
			$this->future	= $data->query->results->channel->item->forecast;
		}
	}
}
class Display_Weather extends Yahoo_Weather
{	
	private $temp = false;
	
	public function __construct($location, $temp)
	{
		try {			
			switch($temp)
			{
				case "c":
				case "f":
					parent::__construct($location);
				 	$this->temp = $temp;
				break;
					
				default:
					throw new Exception("Temperature must be in either C or F.");
				break;
			}
		}
		catch (Exception $e)
		{
		    echo $e->getMessage(), "\n";
		}
	}
	public function displayCurrentWeather()
	{
		if($this->current != false)
		{
			echo '<div class="wthr-wrapper text-center">';
	        echo '<div class="icon-wrap"><img src="path/to/images/weather-icons/'.$this->current->code.'.png" /></div>';
	        echo '<div class="text-cht-wthr current">'.$this->getTemp($this->current->temp).'</div>';
	        echo '<div class="wthr-txt-wrap">'.$this->current->text.'</div>';
	        echo '</div>';
		}
	}
	public function displayFutureWeather()
	{
		if($this->future != false)
		{
			foreach ($this->future as $key => $day_weather)
			{
				echo '<div class="wthr-wrapper text-center">';
		        echo '<div class="date-wrap">'.$day_weather->date.'</div>';
		        echo '<div class="icon-wrap"><img src="path/to/images/weather-icons/'.$day_weather->code.'.png" /></div>';
		        echo '<div class="text-cht-wthr high">High: '.$this->getTemp($day_weather->high).'</div>';
		        echo '<div class="text-cht-wthr low">Low: '.$this->getTemp($day_weather->low).'</div>';
		        echo '<div class="wthr-txt-wrap">'.$day_weather->text.'</div>';
		        echo '</div>';
			}
		}
	}
	private function getTemp($temperature)
	{
		if($this->temp == "c")
		{
			return round(($temperature - 32) /1.8) . "&deg; C";
		}		
		return $temperature."&deg; F";
	}
}
$weather = new Display_Weather("chicago, il", "c");
$weather->displayCurrentWeather();
$weather->displayFutureWeather();

?>

Using public API endpoint will limit your API call rate limit compared to an authenticated request (Oauth).

• 2000/day on public endpoint (limitation is IP based).
• 20.000/day when using Oauth (with your keys)

https://developer.yahoo.com/weather/