Dynamic redirect script examples

$cart_empty = 1;
if(!class_exists('VmConfig')){
 require_once(JPATH_SITE.'/administrator/components/com_virtuemart/helpers/config.php');
 VmConfig::loadConfig();
}
if(!class_exists('VirtueMartCart')){
 require_once(JPATH_SITE.'/components/com_virtuemart/helpers/cart.php');
}
$cart = VirtueMartCart::getCart(false);
$data = $cart->prepareAjaxData();
foreach ($data->products as $product){
 /*echo $product['product_name'];*/
 $cart_empty = 0;
}

if($cart_empty){
 /*cart is empty*/
 $redirect_menuitem_id = 23; /*id of profile page*/
}else{
 /*cart contains at least one product*/
 $redirect_menuitem_id = 988; /*id of my basket page*/
}

if($user_id){
 /*user is logged in */
 
 /*get user email*/
 $email = '';
 $database->setQuery("SELECT email "
 ." FROM #__users "
 ." WHERE id='$user_id' " 
 );
 $rows = $database->loadObjectList();
 foreach($rows as $row){ 
 $email = $row->email; 
 break;
 }
 
 if($email){
 $temp = explode('@', $email);
 $domain = $temp[1];
 if($domain){
 if($first_time_login){
 $new_group = 0;
 
 /*company 1*/
 if($domain=='hotmilk1.com'){
 $new_group = 9;
 }
 
 /*company 2*/
 if($domain=='hotmilk2.com'){
 $new_group = 10;
 } 
 
 /*company 3*/
 if($domain=='hotmilk3.com'){
 $new_group = 11;
 } 
 
 if($new_group){
 /*delete old groups*/
 $database->setQuery("DELETE FROM #__user_usergroup_map WHERE user_id='$user_id'");
 $database->query();
 /*set new group*/
 $database->setQuery("INSERT INTO #__user_usergroup_map SET user_id='$user_id', group_id='$new_group'");
 $database->query();
 }
 } 
 } 
 } 
 $redirect_menuitem_id = 455;
}else{
 /*user is not logged in*/
 /*to registration page*/
 $redirect_menuitem_id = 299;
}

if($country_code=='IT' && !strpos($_SERVER['SERVER_NAME'],'it.domain.com')){
 $redirect_url = 'http://it.domain.com';
}

if($country_code=='DE' && !strpos($_SERVER['SERVER_NAME'],'de.domain.com')){
 $redirect_url = 'http://de.domain.com';
}

if($country_code=='BE' && !strpos($_SERVER['SERVER_NAME'],'blx.domain.com')){
 $redirect_url = 'http://blx.domain.com';
}