/**
* Retrieve multiple items from the cache by key.
* Items not found in the cache will have a null value.
*
* @param array $keys
* @return array|null
*/
protected function retrieveMany(array $keys)
{
$retrieved = [];
$data = Cache::many($keys);
foreach ($data as $item) {
if ($item) {
$retrieved[] = $item;
}
}
if (count($retrieved)) {
return $data;
}
}
