$key = $_REQUEST['key'];
$keys = explode("_", $key);
$id = $keys[0]."_".$keys[1];
//get value for specific key from memcache
$array = $cache->get($id);

// check if there already exists a record in the mem cache
// if no
if(!$array)
{
if($keys[2]==1)
$array = Array(”thumbsup”=>1,”thumbsdown”=>0);
else if($keys[2]==2)
$array = Array(”thumbsup”=>0,”thumbsdown”=>1);
$cache->set($id,$array);
}
else
{
// increment the count
if($keys[2]==1)
$type = “thumbsup”;
else if($keys[2]==2)
$type = “thumbsdown”;

$array[$type] = $array[$type]+1;
$cache->set($id,$array);
}