View file htrocks.net/adfonic.php

<?php

/**
 * NOTE: In order for tracking cookies to be set, the ads must be requested prior to any
 * output going to the user
 * 
 * Potential additional parameters:
 * u.age - actual age
 * u.ageLow and u.ageHigh - for age range
 * u.lang - override language (default is 'en-us')
 */
class Adfonic {
	static $adfonic_ad_base = 'http://adfonic.net/ad';

	var $client_id;
	function __construct($client_id=null){
		if (isset($client_id)) {
		   $this->client_id = md5($client_id);
		}
	}	
	
	/**
	 *  Primary interface. Pass the ad identifier, any extra targeting parameters and tags
	 * @param params - name value parameters for targeting, do not url encode
	 * @return Ad content to directly embed
	 */
	function get_ad_content($ad_id,$params=array(),$tags=array()){
		$ad_url = $this->build_ad_url($ad_id,$params,$tags);
			
		$ch = curl_init($ad_url);
		curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
		
		$output = curl_exec($ch);
		$info = curl_getinfo($ch);
		
		
		$adcontent = '';
		if ($output == false || $info['http_code'] != 200){
			$adcontent = '<!-- no ad available, received response '. $info['http_code'] . '-->';	
		}
		else {
			parse_str($output, $rvals);

			// handle "magic" quote escaping
			if (get_magic_quotes_gpc()){
				$rvals = array_map('stripslashes',$rvals);				
			}
			// WARNING: This will only work if the output hasn't started going to the user
			if (isset($rvals['trackingId'])){
				setcookie('adfonic-tracking-id',$rvals['trackingId'],time() + (3600 * 24 * 365 * 2)); // 2 years
			}
        	    
        
			
			if (isset($rvals['error'])){
				$adcontent = '<!-- no ad available, Adfonic error: ' . $rvals['error'] . '-->';
			}
			else {	
			
				$adcontent = $rvals['adContent'];
			}
		}
		
		curl_close($ch);
		
		return $adcontent;
	}
	
	/**
	 * Retrieve url for the given id and any extra parameters (tags, etc)
	 *
	 */
	function build_ad_url($ad_id,$params=array(),$tags=array()){
		$ad_url = self::$adfonic_ad_base. "/$ad_id?";

		// url params as key=value
		$u_params = array();
		
		// copy the user-supplied parameters
		foreach ($params as $k=>$v){
			$u_params[] = '$k='.urlencode($v);
		}
		
		// tracking id
		$rid = $this->get_tracking_id();
		if (isset($rid)) {		
		   $u_params[]= 'r.id='.$this->get_tracking_id();
		}
		
		// user's ip address		
		$u_params[] = 'r.ip='.$this->get_ip();
		
                // pass on all the http headers
                foreach ($_SERVER as $k=>$v) {
                    if (substr(strtolower($k),0,5) == 'http_') {
                        $k = str_replace('_','-', strtolower(substr($k,5)));
                        if ($k != 'cookie') {
                            $u_params[] = 'h.'.$k.'='.urlencode($v);
                        }
                    }
                }

		if (! empty($tags)){
			$u_params[] = "p.tags=".urlencode(join(",",$tags));
		}
		
		$query_string = join("&",$u_params);

		$ad_url .= $query_string;

		
		return $ad_url;
	}

	/**
	 * Extract tracking id from request/cookies
	 *
	 */
	function get_tracking_id(){
		if (isset($_COOKIE['adfonic-tracking-id'])){
			return $_COOKIE['adfonic-tracking-id'];
		}
		else {
			return $this->client_id;
		}
		
	}
	
	function get_ip(){
		if (isset($_SERVER['HTTP_CLIENT_IP'])){
			return $_SERVER['HTTP_CLIENT_IP'];
		}
		
		return $_SERVER['REMOTE_ADDR'];
	}
}


?>