public function get($key, $defaultValue = null) {
        return ArrayHelper::getValue($this->data, $key, $defaultValue);
    }
public function get($key, $defaultValue = null) {
        return ArrayHelper::getValue($this->data, $key, $defaultValue);
    }
public function get ( $ key , $ defaultValue = null ) { return ArrayHelper :: getValue ( $ this -> data , $ key , $ defaultValue ) ; }
Get config data by its key
@param string $key
@param mixed  $defaultValue
@return mixed
Get config data by its key