current_sports.php

<?php
h2o::addTag('load_sports_events');
class Load_sports_events_Tag extends H2o_Node {
    function render($context, $stream) {
        $cache = h2o_cache($context->options);
        $cache_key = 'digg_xml_feed';
        
        # try cached 
        if (! ($feed = $cache->read($cache_key))) {
            $feed = file_get_contents('http://feeds.digg.com/digg/popular.rss');
            $cache->write($cache_key, $feed);
        }
        
        $feed = new SimpleXMLElement($feed);
        $feed = $feed->xpath('//channel/item');
        $context->set('sports_events', $feed);
    }
}

?>

webmodel.php

<?php
/*
 *	Class: WebModel
 *		defines features to request/post web content including getting content of a static/dynamic
 * web location. It also allows secure connection, post/get method, http authentication.
 *
 *	Dependencies:
 *		PHP 4+ with CURL extension enabled.
 *
 *	Author:
 *		Taylor Luk
 *
 *	Example:
 *		(code)
 *		// Simple get operation from a web resource
 *		$http = new WebModel;
 *		$http->get("http://domain.com");
 *
 *		// Post data to a web address
 *		$http = new WebModel;
 *		$people = $http->post("http://people.com/search.php", array(
 *			"name" => "tom",
 *			"age" => "26"
 *		))
 *
 *		// Request/Post/Retrive information from a restricted web location where
 *		// secure connection and authentication is requried.
 *		$http = new WebModel;
 *		$http->autenticate = 'username:password';
 *		$businessAddr = $http->post("http://address/to/secure/location", array(
 *			"APIKey" => "2Asdf34QW234ASDFASDFXc",
 *			"location" => "sydney"
 *		));
 *		(end)
 *
 */
class WebModel {
	var $timeout = 30;
	var $curl = null;
	var $authenticate = false;
	var $method = "GET";
	var $response;
	var $info;
	var $error;

	function WebModel(){

	}

/*	Function: get
 * 		perform a http get request against a url with supplied parameters.
 *
 * 	Arguments:
 * 		$url - web location to perform get request.
 * 		$vars - array additional post parameters in key and value pair.
 */
	function get($url, $vars=array()){
    	return $this->request('GET', $url, $vars);
	}

/*	Function: post
 * 		perform a http post request against a url with supplied parameters,
 * 		if post content is empty
 * 		then stop.
 *
 * 	Arguments:
 * 		$url - web location to perform post request.
 * 		$vars - array additional post parameters in key and value pair.
 */
	function post($url, $vars){
		if(!empty($vars)){
    		return $this->request('POST', $url, $vars);
		} else{
			return false;
		}
	}

/*	Function: request
 * 		perform a http post request against a url with supplied parameters,
 * 		if post content is empty
 * 		then stop.
 *
 * 	Arguments:
 * 		$url - web location to perform post request.
 * 		$vars - array additional post parameters in key and value pair.
 */
	function request( $method = null, $url, $vars = array()){
		$this->curl = curl_init();
		if(! $this->curl){
			return false;
		}

		if($method){
			$this->method = $method;
		}

		$vars = $this->_toUrlQuery($vars);

		/*	Default	*/
		curl_setopt($this->curl, CURLOPT_FOLLOWLOCATION, true);
		curl_setopt($this->curl, CURLOPT_RETURNTRANSFER, true);
		curl_setopt($this->curl, CURLOPT_TIMEOUT, $this->timeout);
		curl_setopt($this->curl, CURLOPT_USERAGENT, "Mozilla/5.0");
	    curl_setopt($this->curl, CURLOPT_COOKIEJAR, 'cookie.txt');
	    curl_setopt($this->curl, CURLOPT_COOKIEFILE, 'cookie.txt');
		curl_setopt($this->curl, CURLOPT_SSL_VERIFYPEER, false);


		/*	Request Methods */
		if($this->method == "POST"){
			curl_setopt($this->curl, CURLOPT_POST, true);
        	curl_setopt($this->curl, CURLOPT_POSTFIELDS, $vars);
		}
		else if(!empty($vars)){
            $url = $url.'?'.$vars;
		}

		/*	Request URL	*/
		curl_setopt($this->curl, CURLOPT_URL, $url);

		/*	Authenticate	*/
		if($this->authenticate){
			$this->authentication();
		}

		/*	Execute Request	*/
		$this->response = curl_exec($this->curl);
		$error = $this->detectHttpError();

		/*	Finalise	*/
		curl_close($this->curl);
		if($error){
			return false;
		}
		return $this->response;
	}

	function detectHttpError(){
		$this->info = curl_getinfo($this->curl);
		/*	error detection	*/
		if(!$this->response){
			$this->error = curl_error($this->curl);
			return true;
		}
		else if((int)trim($this->info['http_code']) >= 400){
			$this->error = "Http ".$this->info['http_code']." Error";
			return true;
		}
		return false;
	}

/*	Function: authentication
 * 		if user supplies credential information then perform http authentication against
 * 		desired web location.
 */
	function authentication(){
		$credential = explode(":", $this->authenticate);

		if(sizeof($credential) == 0) {
			return false;
		}
		$user = $credential[0];
		$pass = @$credential[1];

		curl_setopt($this->curl, CURLOPT_USERPWD, "$user:$pass");
		return true;
	}

/*	Function: _toUrlQuery
 * 		private function to transform array of query into url query.
 */
	function _toUrlQuery($qarray){
		$query = array();
		foreach($qarray as $key => $value){
			array_push($query, $key."=". urlencode($value));
		}
		return join("&", $query);
	}
}
?>