Grav\Plugin\Admin\AdminBaseController::jsonDecode PHP Method

    protected function jsonDecode(array $data)
    {
        foreach ($data as &$value) {
            if (is_array($value)) {
                $value = $this->jsonDecode($value);
            } else {
                $value = json_decode($value, true);
            }
        }
        return $data;
    }