pyrocms扩展核心插件

我将扩展分析插件。我想得到最受欢迎的网页。我阅读了谷歌api文档。最棒的是，已经有一个php库可以从谷歌分析api中获取数据（很棒！），而且在pyro核心文件中还有一个很好的插件。我指的是插件集成。

现在我想要的是为这个插件添加新的方法。同样，这不是编辑核心文件的好主意。因此，有两种方法：

1-将插件重新实现为共享插件（复制已经存在的代码）2-扩展核心插件。

但不幸的是，我不知道如何扩展核心插件。：（

核心是这样的：

<?php defined('BASEPATH') OR exit('No direct script access allowed');
/**
 * Integration Plugin
 *
 * Attaches a Google Analytics tracking piece of code.
 *
 * @author      PyroCMS Dev Team
 * @package     PyroCMS'Core'Plugins
 */
class Plugin_Integration extends Plugin
{
    /**
     * Partial
     *
     * Loads Google Analytic
     *
     * Usage:
     *   {{ integration:analytics }}
     *
     * @return string The analytics partial view.
     */
    function analytics()
    {
        return $this->load->view('fragments/google_analytics', NULL, TRUE);
    }
    /**
     * Visitors
     *
     * Uses Google Analytics data to show page views 
     * and visitors for a given time period
     *
     * Usage:
     *   {{ integration:visitors }}
     *
     * @return array The number of page views and visitors.
     */
    public function visitors()
    {
        $data       = array('visits' => 0, 'views' => 0);
        $start      = $this->attribute('start', '2010-01-01');
        $end        = $this->attribute('end', date('Y-m-d'));
        $refresh    = $this->attribute('refresh', 24); // refresh the cache every n hours
        if (Settings::get('ga_email') and Settings::get('ga_password') and Settings::get('ga_profile'))
        {
            // do we have it? Return it
            if ($cached_response = $this->pyrocache->get('analytics_plugin'))
            {
                return $cached_response;
            }
            else
            {
                try
                {
                    $this->load->library('analytics', array(
                        'username' => Settings::get('ga_email'),
                        'password' => Settings::get('ga_password')
                    ));
                    // Set by GA Profile ID if provided, else try and use the current domain
                    $this->analytics->setProfileById('ga:'.Settings::get('ga_profile'));
                    $this->analytics->setDateRange($start, $end);
                    $visits = $this->analytics->getVisitors();
                    $views  = $this->analytics->getPageviews();
                    if ($visits)
                    {
                        foreach ($visits as $visit)
                        {
                            if ($visit > 0) $data['visits'] += $visit;
                        }
                    }
                    if ($views)
                    {
                        foreach ($views as $view) 
                        {
                            if ($view > 0) $data['views'] += $view;
                        }
                    }
                    // Call the model or library with the method provided and the same arguments
                    $this->pyrocache->write($data, 'analytics_plugin', 60 * 60 * (int) $refresh); // 24 hours
                }
                catch (Exception $e)
                {
                    log_message('error', 'Could not connect to Google Analytics. Called from the analytics plugin');
                }
            }
            return $data;
        }
    }
}

我需要添加这样的方法，但在一个单独的插件中，该插件扩展到插件之上

public function most_viewed()
{//the logic}

有人能给我一个建议吗？