src/Modules/Auth/Providers/FileUserProvider.php
public function getUserGroups($user_name)
    {
        if (isset($this->users[$user_name])) {
            return $this->users[$user_name]['groups'];
        } else {
            return false;
        }
    }
public function getUserGroups($user_name)
    {
        if (isset($this->users[$user_name])) {
            return $this->users[$user_name]['groups'];
        } else {
            return false;
        }
    }
@param string $user_name

@return array|false