modules/setting/models/Setting.php
public function redactorOptions()
    {
        if (strlen($this->options) > 1) {
            $options = str_replace(' ', '', $this->options);
            return explode(",", $options);
        }

        return ['html', 'formatting', 'bold', 'italic', 'deleted',
            'unorderedlist', 'orderedlist', 'outdent', 'indent',
            'image', 'file', 'link', 'alignment', 'horizontalrule'];
    }
public function redactorOptions()
    {
        if (strlen($this->options) > 1) {
            $options = str_replace(' ', '', $this->options);
            return explode(",", $options);
        }

        return ['html', 'formatting', 'bold', 'italic', 'deleted',
            'unorderedlist', 'orderedlist', 'outdent', 'indent',
            'image', 'file', 'link', 'alignment', 'horizontalrule'];
    }
Returns buttons array to show on redactor editor
Eg: can be set in database as comma separated in column options as: html, unorderedlist, link
@return array