public function get()
{
$key = 'db';
$redis = new Redis();
if ($value = $redis->get($key)) {
return $key;
} else {
$memcached = new Memcached();
if ($value = $memcached->get($key)) {
return $value;
} else {
$db = new Db();
if ($value = $db->get($key)) {
return $value;
}
}
}
return '';
}
