/**
* Get a subset of the items from the input data.
*
* @param array $keys
* @return array
*/
public function only($keys)
{
$keys = is_array($keys) ? $keys : func_get_args();
$results = [];
$inputs = $this->all();
foreach ($keys as $key) {
Arrays::set($results, $key, Arrays::get($inputs, $key));
}
return $results;
}