components/Kato.php
public static function setting($key)
    {
        $model = Setting::find()
            ->where(['define' => $key])
            ->one();

        if (!is_null($model)) {
            return $model->renderOutput();
        }

        return false;
    }
public static function setting($key)
    {
        $model = Setting::find()
            ->where(['define' => $key])
            ->one();

        if (!is_null($model)) {
            return $model->renderOutput();
        }

        return false;
    }
Get settings for Kato
Usage:

```php
$setting = Yii::$app->kato->setting('site_name');
```
@param $key
@return bool