codeigniter 看一看 (2) 翻页控件改编版

由于有一个翻页的需求，原来做的翻页比较垃圾，所以就改装下Pagination了。 目前完成的，没有留出数据库的交互的参数，基于在很少改动原来程序的情况下，实现翻页，代码如下：

<?php
/**
 * Pagination Class
 *
 * @category    Pagination
 * @author        Martin
 * @link        This class is based on the file from codeigniter
 */
class Pagination {

    var $base_url            = ''; // The page we are linking to
    var $total_rows          = ''; // Total number of items (database results)
    var $per_page             = 3; // Max number of items you want shown per page
    var $num_links            =  4; // Number of "digit" links to show before/after the currently viewed page
    var $cur_page             =  0; // The current page being viewed
    var $first_link           = '&lsaquo; First';
    var $next_link            = '&gt;';
    var $prev_link            = '&lt;';
    var $last_link            = 'Last &rsaquo;';
    var $full_tag_open        = '';
    var $full_tag_close        = '';
    var $first_tag_open        = '';
    var $first_tag_close    = '&nbsp;';
    var $last_tag_open        = '&nbsp;';
    var $last_tag_close        = '';
    var $cur_tag_open        = '&nbsp;<b>';
    var $cur_tag_close        = '</b>';
    var $next_tag_open        = '&nbsp;';
    var $next_tag_close        = '&nbsp;';
    var $prev_tag_open        = '&nbsp;';
    var $prev_tag_close        = '';
    var $num_tag_open        = '&nbsp;';
    var $num_tag_close        = '';
    var $url_params          = null;

    /**
     * Constructor
     *
     * @access    public
     * @param    array    initialization parameters
     */
    function Pagination($params = array())
    {
        if (count($params) > 0)
        {
            $this->initialize($params);
        }
    }

    // --------------------------------------------------------------------

    /**
     * Initialize Preferences
     *
     * @access    public
     * @param    array    initialization parameters
     * @return    void
     */
    function initialize($params = array())
    {
        if (count($params) > 0)
        {
            foreach ($params as $key => $val)
            {
                if (isset($this->$key))
                {
                    $this->$key = $val;
                }
            }
        }
        $this->url_params = $_GET;
    }

    // --------------------------------------------------------------------

    /**
     *
     *
     * @param    array    initialization parameters
     * @return    string
     */
    function getUrl()
    {
        $linkUrl =     $this->base_url . "?";
        foreach ($this->url_params as $key => $value)
        {
            $linkUrl.= $key . "=".$value."&";
        }
        return $linkUrl;
    }

    function setCurrentPage($currentpage)
    {

        $this->url_params['cp'] = $currentpage;

    }

    function setPerPage($perpage)
    {
        $this->url_params['pp'] = $currentpage;
    }

    // --------------------------------------------------------------------

    /**
     * Generate the pagination links
     *
     * @access    public
     * @return    string
     */
    function create_links()
    {
        if( !$this->url_params['pp'] )
        {
            $this->setPerPage($this->per_page);
        }
        // If our item count or per-page total is zero there is no need to continue.
        if ($this->total_rows == 0 OR $this->per_page == 0)
        {
           return '';
        }

        // Calculate the total number of pages
        $num_pages = ceil($this->total_rows / $this->per_page);

        // Is there only one page? Hm... nothing more to do here then.
        if ($num_pages == 1)
        {
            return '';
        }

        if ( ! is_numeric($this->cur_page))
        {
            $this->cur_page = 0;
        }
        // Is the page number beyond the result range?
        // If so we show the last page
        if ($this->cur_page > $this->total_rows)
        {
            $this->cur_page = ($num_pages - 1) * $this->per_page;
        }

        $uri_page_number = $this->cur_page;
        $this->cur_page = floor(($this->cur_page/$this->per_page) + 1);

        // Calculate the start and end numbers. These determine
        // which number to start and end the digit links with
        $start = (($this->cur_page - $this->num_links) > 0) ? $this->cur_page - ($this->num_links - 1) : 1;
        $end   = (($this->cur_page + $this->num_links) < $num_pages) ? $this->cur_page + $this->num_links : $num_pages;

        // Add a trailing slash to the base URL if needed
        //$this->base_url = preg_replace("/(.+?)/*$/", "\1/",  $this->base_url);
        echo $this->base_url;

          // And here we go...
        $output = '';

        // Render the "First" link
        if  ($this->cur_page > $this->num_links)
        {
            $output .= $this->first_tag_open.'<a href="'.$this->base_url.'">'.$this->first_link.'</a>'.$this->first_tag_close;
        }

        // Render the "previous" link
        if  (($this->cur_page - $this->num_links) >= 0)
        {
            $i = $uri_page_number - $this->per_page;
            if ($i == 0) $i = '';
            $this->setCurrentPage($i);
            $output .= $this->prev_tag_open.'<a href="'.$this->getUrl().'">'.$this->prev_link.'</a>'.$this->prev_tag_close;
        }

        // Write the digit links
        for ($loop = $start -1; $loop <= $end; $loop++)
        {
            $i = ($loop * $this->per_page) - $this->per_page;

            if ($i >= 0)
            {
                if ($this->cur_page == $loop)
                {
                    $output .= $this->cur_tag_open.$loop.$this->cur_tag_close; // Current page
                }
                else
                {
                    $n = ($i == 0) ? '' : $i;
                    $this->setCurrentPage($n);
                    $output .= $this->num_tag_open.'<a href="'.$this->getUrl().'">'.$loop.'</a>'.$this->num_tag_close;
                }
            }
        }

        // Render the "next" link
        if ($this->cur_page < $num_pages)
        {
            $this->setCurrentPage($this->cur_page * $this->per_page);
            $output .= $this->next_tag_open.'<a href="'.$this->getUrl().'">'.$this->next_link.'</a>'.$this->next_tag_close;
        }

        // Render the "Last" link
        if (($this->cur_page + $this->num_links) < $num_pages)
        {
            $i = (($num_pages * $this->per_page) - $this->per_page);
            $this->setCurrentPage($i);
            $output .= $this->last_tag_open.'<a href="'.$this->getUrl().'">'.$this->last_link.'</a>'.$this->last_tag_close;
        }

        // Kill double slashes.  Note: Sometimes we can end up with a double slash
        // in the penultimate link so we'll kill all double slashes.
        $output = preg_replace("#([^:])//+#", "\1/", $output);

        // Add the wrapper HTML if exists
        $output = $this->full_tag_open.$output.$this->full_tag_close;
        return $output;
    }
}
// END Pagination Class
?>

例子如下：

$currentPage = $_GET['cp'];
    $perPage = $_GET['pp'];
    $query = "SELECT * table";
    $result = mysql_query($query,$GLOBALS['db']);
    $hitCount = mysql_num_rows ($result);
    $offset = '0,';
    $limit = '3';
    if($currentPage)
    {
        $offset = $currentPage.",";
    }

    if($perPage)
    {
        $limit = $perPage;
    }

    $query .= " LIMIT ".$offset.$limit;


    //now you can print your content
    ...


    //disaply the pagination hyperlinker
    $pageTest = new Pagination();
        $pageTest->initialize( array(
                                    'base_url'         => 'testPagination.php',
                                    'total_rows'     => $hitCount,
                                    'per_page'         => $limit,
                                    'cur_page'       => $currentPage,
                                    'full_tag_open'     => '<p>',
                                    'full_tag_close' => '</p>'
                                    )
                               );
        echo $pageTest->create_links();

好了，放心使用吧，当然如果你有需要还可以根据需要扩展下数据的绑定，样式等