app\helpers\RequestParams::all PHP Method

    public function all($name = "")
    {
        if ($name) {
            return $this->paramData[$name];
        }
        return $this->paramData;
    }

 public function setOption($varName, RequestParams $allParams)
 {
     $value = $allParams->all($varName);
     $arParams = ['value' => $value, 'codeName' => $this->variableName, 'groupName' => $this->groupName];
     $event = new BaseContainerEvent($this->c, $arParams);
     $event = $this->c->dispatcher->dispatch('middleware.' . $varName . '.before', $event);
     $value = $event->getParams()['value'] ? $event->getParams()['value'] : $allParams->all($this->variableName);
     $result = $this->storeParams($value, $varName);
     $arParams = ['result' => $result, 'allParams' => $allParams];
     $event = new BaseContainerEvent($this->c, $arParams);
     $this->c->dispatcher->dispatch('middleware.' . $varName . '.after', $event);
 }