leadsource.php

<?php
/****************************
 *
 * Lead Source Tracking
 *
 ****************************
 * @Author: 		Ian Ray
 * @Created: 		17-May 2015
 * @Updated: 		10-July 2015
 * @Description: 	Created for use with Gravity Forms and Salesforce Lead Source field
 *
 * USAGE:
 * 0. Check Session activity. Recreate new session if over 30 mins since last activity
 * 1. Saves $_SESSION['leadSource'] and $_SESSION['refer']
 * 2. Gravity Form: Hidden field {SESSION:leadSource} and {SESSION:refer}
 * 3. Salesforce Web-to-Lead mapping
 * 4. Thank You page (with $_REQUEST['eid']) destroys session variables
 *
 *
 * LOGIC: 
 * 		IF:		 Referer data is provided by originating server
 * 		THEN:  Process data to determine Lead Source, and assign Session Vars
 * 		ELSE:	 Assume it is Web Direct
 * 
 *
 * note from ian: This is not 100% valid of an assumption to make, 
 * if you want to analyze referral traffic sources, use Google Analytics not SalesForce.
 *
 **************************/


// Last request was more than 30 minutes ago
if (isset($_SESSION['activity']) && (time() - $_SESSION['activity'] > 1800)) {
    session_unset();
    session_destroy();
}

if(session_id() == '')
	session_start(); 


//Always tracking last activity of Session
$_SESSION['activity'] = time();

 
if( !isset($_SESSION['leadSource']) && isset($_SERVER['HTTP_REFERER']) ) :

	function searchArray($search, $array) {
		foreach($array as $key => $value) {
			if (strpos($search,$value)) 
				return $key;
		}
		return false;
	}

	$social = array('twitter.com','t.co','facebook.com','fb.com','linkedin.com','flickr.com','vimeo.com','xing.com','instagram.com','foursquare.com','fb.me','plus.google.com','youtube.com','youtu.be','reddit.com','tumblr.com');
	$search = array('ask','bing','msn.com','yahoo','google');

	$_SESSION['orig'] = parse_url($_SERVER['HTTP_REFERER']);
	
	switch(true) {
		
		case ( isset($_REQUEST['gclid']) || isset($_REQUEST['kw']) ) :
			$leadSource = "Search - Paid";
			break;
	
		case (strpos($_SESSION['orig']['host'], str_replace("http://",get_bloginfo('url'))) != false) :
			$leadSource = "Web Direct";
			break;

		case ( searchArray($_SESSION['orig']['host'], $search) != false ) :
			$leadSource = "Search - Organic";
			break;

		case ( in_array($_SESSION['orig']['host'], $social) ) :
			$leadSource = "Social";
			break;
			
		default :
			$leadSource = "Unknown";
			break;		
	}
	
	if($leadSource == "Unknown" && (strpos($_SESSION['orig']['host'], '.') != false) )
		$leadSource = "Referring Website";


	$_SESSION['leadSource'] = $leadSource;
	$_SESSION['refer'] 		= $_SERVER['HTTP_REFERER'];	

endif;

if( !isset($_SESSION['refer']) ) :

	$_SESSION['leadSource'] = "Web Direct";
	$_SESSION['refer'] 		= "Not Provided";	

endif;

//Clear Tracking Variables on thank you pages
if(isset($_REQUEST['eid']))
	session_destroy();

?>