gistfile1.php

//
// Detect's the user's mobile client
// If it is a matched client, creates a referral item in parse and returns a redirect URL for the AppStore
//
function createReferral($params = array()) {
  require_once '../cms/Mobile_Detect.php';
  $detect = new Mobile_Detect;
  $ios_url = 'https://itunes.apple.com/us/app/aftermath-pvp-guilds-strategy/id702615597?ls=1&mt=8';
  
  $clients = array('iPhone'=>$ios_url,
                   'iPod'=>$ios_url,
                   'iPad'=>$ios_url);
  $device = null;
  foreach($clients as $client => $url) {
    if($detect->is($client)) {
      $device = $client;
      break;
    }
  }
  if(!$device) {
    return $ios_url;
  }
  
  $v = $detect->version($device);
  $params['ip'] = $_SERVER['REMOTE_ADDR'];
  $params['device'] = $device ? $device : 'OSX';
  $params['os_version'] = $v ? $v : '';
  $params['timestamp'] = time();
  
  // Save $params in a database somewhere...
  
  return $clients[$device];
}

// 
$from = isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : '';
$from = explode('?', $from);
$from = sizeof($from) >= 2 ? $from[1] : '';
$qps = explode('&', $from);
$params = array();
foreach($qps as $qp) {
  $parts = explode('=', $qp);
  if(sizeof($parts)>=2 && strpos($parts[0], 'utm_')===0) {
    $params[substr($parts[0],4)] = $parts[1];
  }
}

header('location: '. createReferral($params));