Cookie being destroyed when browser quits

[ThePlanet]

I am currently playing around with cookies in my website, the first thing I do is run a check as to whether the user has cookie, if they dont I display a menu wth 3 options if they click it creates a cookie, but if then quit the browser the cookie is destroyed, here is my code, \[code\]function createRandomId() { $chars = "abcdefghijkmnopqrstuvwxyz023456789"; srand((double)microtime() * 1000000); $i = 0; $unique = ''; while ($i <= 7) { $num = rand() % 33; $tmp = substr($chars, $num, 1); $unique = $unique.$tmp; $i++; } return md5($unique);}function index() { // $data is the array of data that is passed to views, setup it up $data = http://stackoverflow.com/questions/2064995/array(); // We need to setup the cookie that will be used site, this will be used to cross reference // The user with the options they have selected, to do this we first need to load the session model // Check if the user has a cookie already, if they it means they have been to the site in the last 30 days. if(!isset($_COOKIE['bangUser'])) { // Get createRandomId() method and return a unique ID for the user $unique = ''; // Setting the cookie, name = bangUser, the cookie will expire after 30 days setcookie("bangUser", $unique, time() + (60*60*24*30)); $data['firstTime'] = TRUE; } else { $data['notFirstTime'] = TRUE; } // Load the view and send the data from it. $this->load->view('base/index', $data); }function createCookie() { // Function gets called when the user clicks yes on the firstTime menu. // The purpose of this function is to create a cookie for the user. // First we'll give them a unique ID $unique = $this->createRandomId(); // With the unique ID now available we can set our cookie doing the same function as before setcookie("bangUser", $unique, time() + (60*60*24*30)); // Now that the cookie is set we can do a 100% check, check that cookie is set and if it is redirect to // to the homepage if(isset($_COOKIE['bangUser'])) { redirect('welcome'); }}\[/code\]Basically the index() function does the check and the createCookie creates a new cookie, can any one see any problems?