mihaildev\elfinder\PathController::getOptions PHP Method

    public function getOptions()
    {
        if ($this->_options !== null) {
            return $this->_options;
        }
        $subPath = Yii::$app->request->getQueryParam('path', '');
        $this->_options['roots'] = [];
        $root = $this->root;
        if (is_string($root)) {
            $root = ['path' => $root];
        }
        if (!isset($root['class'])) {
            $root['class'] = Local::className();
        }
        if (!isset($root['path'])) {
            $root['path'] = '';
        }
        if (!empty($subPath)) {
            if (preg_match("/\\./i", $subPath)) {
                $root['path'] = rtrim($root['path'], '/');
            } else {
                $root['path'] = rtrim($root['path'], '/');
                $root['path'] .= '/' . trim($subPath, '/');
            }
        }
        $root = Yii::createObject($root);
        /** @var Local $root*/
        if ($root->isAvailable()) {
            $this->_options['roots'][] = $root->getRoot();
        }
        if (!empty($this->watermark)) {
            $this->_options['bind']['upload.presave'] = 'Plugin.Watermark.onUpLoadPreSave';
            if (is_string($this->watermark)) {
                $watermark = ['source' => $this->watermark];
            } else {
                $watermark = $this->watermark;
            }
            $this->_options['plugin']['Watermark'] = $watermark;
        }
        $this->_options = ArrayHelper::merge($this->_options, $this->connectOptions);
        return $this->_options;
    }