php

一个简单的CI分页类 

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/** 
 *  
 * 关于 页码有效性的判断需要加在 控制器中判断，即当页码数<1或者>总页数 
 * 
 */  
   
class Custom_pagination  
{  
    var $page_url = ''; //分页目标URL  
    var $page_size = 10; //每一页行数  
    var $page_num = 1;//页码  
    var $rows_num= '';//数据总行数  
    var $links_num= 3;//选中链接前后的链接数，必须大于等于1  
  
    var $anchor_class= '';//链接样式类  
    var $current_class= '';//当前页样式类  
    var $full_tag_open= '';//分页开始标签  
    var $full_tag_close= '';//分页结束标签  
    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($params = array()) //初始化数据  
    {  
        if (count($params) > 0)  
        {  
            foreach ($params as $key => $val)  
            {  
                if (isset($this->$key))  
                {  
                    $this->$key = $val;  
                }  
            }  
        }  
    }  
   
    function create_links()  
    {  
        ///////////////////////////////////////////////////////  
        //准备数据  
        ///////////////////////////////////////////////////////  
        $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)  
        {  
            //有余数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必须大于等于0';  
        }  
        ////////////////////////////////////////////////////////  
        //创建链接开始  
        ////////////////////////////////////////////////////////  
        $output = $this->full_tag_open;  
        $output .= $this->info_tag_open.'共'.$rows_num.'条数据  第 '.$page_num.'/'.$pages.' 页'.$this->info_tag_close;  
        //首页  
        if($page_num > 1)  
        {  
            $output .= $this->first_tag_open.'<a '.$anchor_class.' href="'.site_url($page_url).'" >首页</a>'.$this->first_tag_close;  
        }  
        //上一页  
        if($page_num > 1)  
        {  
            $n = $page_num - 1;  
            $output .= $this->prev_tag_open.'<a '.$anchor_class.' href="'.site_url($page_url.'/'.$n).'" >上一页</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 + $links_num;  
            //判断链接个数是否太少，举例，假设links_num = 2，则链接个数不可少于 5 个，主要是 当page_num 等于 1， 2 和 n，n-1的时候  
            if($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;  
            }  
        }  
        //下一页  
        if($page_num < $pages)  
        {  
            $n = $page_num + 1;  
            $output .= $this->next_tag_open.'<a '.$anchor_class.' href="'.site_url($page_url.'/'.$n).'" >下一页</a>'.$this->next_tag_close;  
        }  
        //末页  
        if($page_num < $pages)  
        {  
            $output .= $this->last_tag_open.'<a '.$anchor_class.' href="'.site_url($page_url.'/'.$pages).'" >末页</a>'.$this->last_tag_close;  
        }  
  
        $output.=$this->full_tag_close;  
        return $output;  
    }  
}

控制器里调用

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$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();</span>  
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<?php  
class page{  
      
    public $page; //当前页  
    public $pagenum;  // 页数  
    public $pagesize;  // 每页显示条数  
    public function __construct($count, $pagesize){  
        $this->pagenum = ceil($count/$pagesize);  
        $this->pagesize = $pagesize;  
        $this->page =(isset($_GET['p'])&&$_GET['p']>0) ? intval($_GET['p']) : 1;  
    }  
    /** 
     * 获得 url 后面GET传递的参数 
     */   
    public function getUrl(){     
        $url = 'index.php?'.http_build_query($_GET);  
        $url = preg_replace('/[?,&]p=(\w)+/','',$url);  
        $url .= (strpos($url,"?") === false) ? '?' : '&';  
        return $url;  
    }  
    /** 
     * 获得分页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".">首页</a> ";  
        }  
        if($this->page!=1){  
            $pagestr.= "<a href=".$url."p=".($this->page-1).">上一页</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).">下一页</a>";  
              
        }  
        if($this->page+5<$this->pagenum){  
            $pagestr.="<a href=".$url."p=".$this->pagenum.">尾页</a> ";  
        }  
        return $pagestr;      
    }  
      
}  
// 测试代码  
$page = new page(100,10);  
$str=$page->getPage();  
echo $str;  
  
?>