$arr = array(1,2,3);
$query = "SELECT * FROM *** WHERE id IN (".implode(',',$arr).")";
setcookie("region_mass", intval($_GET['id']), time()+60*60*24*30);
$output = "";
$mass = explode("-",$_COOKIE['region_mass']);
$query = mysql_query("SELECT * FROM `region` WHERE id IN (".implode(',',$mass).") ") or die(mysql_error());
echo mysql_num_rows($query);
while ($result = mysql_fetch_array($query)) {
$output = $output . $result['name'];
}
echo $output;
var_dump($mass);
var_dump(implode(',',$mass));