Json::respond PHP Method

  protected function respond(array $response, $callback = NULL)
  {
    ee()->load->library('javascript');

    if ($item_root_node = ee()->TMPL->fetch_param('item_root_node'))
    {
      $response_with_nodes = array();

      foreach($response as $item)
      {
        $response_with_nodes[] = array($item_root_node => $item);
      }

      $response = $response_with_nodes;
    }

    if ($root_node = ee()->TMPL->fetch_param('root_node'))
    {
      $response = array($root_node => $response);
    }

    $response = function_exists('json_encode')
      ? json_encode($response)
      : ee()->javascript->generate_json($response, TRUE);

    if ( ! is_null($callback))
    {
      $response = call_user_func($callback, $response);
    }

    if ($this->check_xhr_required())
    {
      $response = '';
    }
    else if ($this->jsonp && $this->callback)
    {
      $response = sprintf('%s(%s)', $this->callback, $response);
    }

    if ($this->terminate)
    {
      @header('Content-Type: '.$this->content_type);

      exit($response);
    }

    return $response;
  }