一個簡單的CI分頁類

/**
 * 
 * 關於 頁碼有效性的判斷需要加在 控制器中判斷，即當頁碼數<1或者>總頁數
 *
 */
 
class Custom_pagination
{
    var $page_url = ''; //分頁目標URL
    var $page_size = 10; //每一頁行數
    var $page_num = 1;//頁碼
    var $rows_num= '';//數據總行數
    var $links_num= 3;//選中鏈接前後的鏈接數，必須大於等於1

    var $anchor_class= '';//鏈接樣式類
    var $current_class= '';//當前頁樣式類
    var $full_tag_open= '';//分頁開始標籤
    var $full_tag_close= '';//分頁結束標籤
    var $info_tag_open= '';
    var $info_tag_close= ' ';
    var $first_tag_open= '';
    var $first_tag_close= ' ';
    var $last_tag_open= ' ';
    var $last_tag_close= '';
    var $cur_tag_open= ' <strong>';
    var $cur_tag_close= '</strong>';
    var $next_tag_open= ' ';
    var $next_tag_close= ' ';
    var $prev_tag_open= ' ';
    var $prev_tag_close= '';
    var $num_tag_open= ' ';
    var $num_tag_close= '';

    public function __construct($params = array())
    {
        if (count($params) > 0)
        {
            $this->init($params);
        }
    }
 
    function init($params = array()) //初始化數據
    {
        if (count($params) > 0)
        {
            foreach ($params as $key => $val)
            {
                if (isset($this->$key))
                {
                    $this->$key = $val;
                }
            }
        }
    }
 
    function create_links()
    {
        ///////////////////////////////////////////////////////
        //準備數據
        ///////////////////////////////////////////////////////
        $page_url = $this->page_url;
        $rows_num = $this->rows_num;
        $page_size = $this->page_size;
        $links_num = $this->links_num;

        if ($rows_num == 0 OR $page_size == 0)
        {
            return '';
        }

        $pages = intval($rows_num/$page_size);
        if ($rows_num % $page_size)
        {
            //有餘數pages+1
            $pages++;
        };
        $page_num = $this->page_num < 1 ? '1' : $this->page_num;

        $anchor_class = '';
        if($this->anchor_class !== '')
        {
            $anchor_class = 'class="'.$this->anchor_class.'" ';
        }

        $current_class = '';
        if($this->current_class !== '')
        {
            $current_class = 'class="'.$this->current_class.'" ';
        }
        if($pages == 1)
        {
            return '';
        }
        if($links_num < 0)
        {
            return '- -！links_num必須大於等於0';
        }
        ////////////////////////////////////////////////////////
        //創建鏈接開始
        ////////////////////////////////////////////////////////
        $output = $this->full_tag_open;
        $output .= $this->info_tag_open.'共'.$rows_num.'條數據  第 '.$page_num.'/'.$pages.' 頁'.$this->info_tag_close;
        //首頁
        if($page_num > 1)
        {
            $output .= $this->first_tag_open.'<a '.$anchor_class.' href="'.site_url($page_url).'" >首頁</a>'.$this->first_tag_close;
        }
        //上一頁
        if($page_num > 1)
        {
            $n = $page_num - 1;
            $output .= $this->prev_tag_open.'<a '.$anchor_class.' href="'.site_url($page_url.'/'.$n).'" >上一頁</a>'.$this->prev_tag_close;
        }
        //pages
        for($i=1;$i<=$pages;$i++)
        {
            $pl = $page_num - $links_num < 0 ? 0 : $page_num - $links_num;
            $pr = $page_num + $links_num > $pages ? $pages : $page_num + $links_num;
            //判斷鏈接個數是否太少，舉例，假設links_num = 2，則鏈接個數不可少於 5 個，主要是 當page_num 等於 1， 2 和 n，n-1的時候
            if($pr < 2 * $links_num + 1)
            {
                $pr = 2 * $links_num + 1;
            }
            if($pl > $pages-2 * $links_num)
            {
                $pl = $pages - 2 * $links_num;
            }
            if($i == $page_num)
            {   //current page
                $output .= $this->cur_tag_open.'<span '.$current_class.' >'.$i.'</span>'.$this->cur_tag_close;
            }else if($i >= $pl && $i <= $pr)
            {
                $output .= $this->num_tag_open.'<a '.$anchor_class.' href="'.site_url($page_url.'/'.$i).'" >'.$i.'</a>'.$this->num_tag_close;
            }
        }
        //下一頁
        if($page_num < $pages)
        {
            $n = $page_num + 1;
            $output .= $this->next_tag_open.'<a '.$anchor_class.' href="'.site_url($page_url.'/'.$n).'" >下一頁</a>'.$this->next_tag_close;
        }
        //末頁
        if($page_num < $pages)
        {
            $output .= $this->last_tag_open.'<a '.$anchor_class.' href="'.site_url($page_url.'/'.$pages).'" >末頁</a>'.$this->last_tag_close;
        }

        $output.=$this->full_tag_close;
        return $output;
    }



}

控制器裏調用

$config['page_url']
= 'about/science';
$config['page_size'] = $pagesize;
$config['rows_num'] = $num_rows;
$config['page_num'] = $page;
 
 
$this->load->library('Custom_pagination');
$this->custom_pagination->init($config);
echo $this->custom_pagination->create_links();

<?php
class page{
	
	public $page; //當前頁
	public $pagenum;  // 頁數
	public $pagesize;  // 每頁顯示條數
	public function __construct($count, $pagesize){
		$this->pagenum = ceil($count/$pagesize);
		$this->pagesize = $pagesize;
		$this->page =(isset($_GET['p'])&&$_GET['p']>0) ? intval($_GET['p']) : 1;
	}
	/**
	 * 獲得 url 後面GET傳遞的參數
	 */ 
	public function getUrl(){   
		$url = 'index.php?'.http_build_query($_GET);
		$url = preg_replace('/[?,&]p=(\w)+/','',$url);
		$url .= (strpos($url,"?") === false) ? '?' : '&';
		return $url;
	}
	/**
	 * 獲得分頁HTML
	 */
	public function getPage(){
		$url = $this->getUrl();
		$start = $this->page-5;
		$start=$start>0 ? $start : 1; 
		$end   = $start+9;
		$end = $end<$this->pagenum ? $end : $this->pagenum;
		$pagestr = '';
		if($this->page>5){
			$pagestr = "<a href=".$url."p=1".">首頁</a> ";
		}
		if($this->page!=1){
			$pagestr.= "<a href=".$url."p=".($this->page-1).">上一頁</a>";
		}
		
		for($i=$start;$i<=$end;$i++){
			$pagestr.= "<a href=".$url."p=".$i.">".$i."</a>  ";						
		}
		if($this->page!=$this->pagenum){
			$pagestr.="<a href=".$url."p=".($this->page+1).">下一頁</a>";
			
		}
		if($this->page+5<$this->pagenum){
			$pagestr.="<a href=".$url."p=".$this->pagenum.">尾頁</a> ";
		}
		return $pagestr;	
	}
	
}
// 測試代碼
$page = new page(100,10);
$str=$page->getPage();
echo $str;


?>