public function getMulti(array $keys, array &$tokens = null)
{
$items = array();
$tokens = array();
foreach ($keys as $key) {
if (!$this->exists($key)) {
// omit missing keys from return array
continue;
}
$items[$key] = $this->get($key, $token);
$tokens[$key] = $token;
}
return $items;
}