public function getConfig(?string $group = null, $default = null)
    {
        return Arr::get($this->config, $group, $default);
    }
public function getConfig(?string $group = null, $default = null)
    {
        return Arr::get($this->config, $group, $default);
    }
public function getConfig ( ? string $ group = null , $ default = null ) { return Arr :: get ( $ this -> config , $ group , $ default ) ; }
Get configuration values.

@param  string|null  $group
@param  mixed  $default

@return mixed
Get configuration values .