一个简单的CI分页类

<spanstyle="font-size:16px;">/**
*
*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
*
*/

classCustom_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='';

publicfunction__construct($params=array())
{
if(count($params)>0)
{
$this->init($params);
}
}

functioninit($params=array())//初始化数据
{
if(count($params)>0)
{
foreach($paramsas$key=>$val)
{
if(isset($this->$key))
{
$this->$key=$val;
}
}
}
}

functioncreate_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($rows_num==0OR$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)
{//currentpage
$output.=$this->cur_tag_open.'<span'.$current_class.'>'.$i.'</span>'.$this->cur_tag_close;
}elseif($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;
}



}

</span>

控制器里调用

<spanstyle="font-size:16px;">$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>

<?php
classpage{

public$page;//当前页
public$pagenum;//页数
public$pagesize;//每页显示条数
publicfunction__construct($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
*/
publicfunctiongetUrl(){
$url='index.php?'.http_build_query($_GET);
$url=preg_replace('/[?,&]p=(\w)+/','',$url);
$url.=(strpos($url,"?")===false)?'?':'&';
return$url;
}
/**
*获得分页HTML
*/
publicfunctiongetPage(){
$url=$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){
$pagestr="<ahref=".$url."p=1".">首页</a>";
}
if($this->page!=1){
$pagestr.="<ahref=".$url."p=".($this->page-1).">上一页</a>";
}

for($i=$start;$i<=$end;$i++){
$pagestr.="<ahref=".$url."p=".$i.">".$i."</a>";
}
if($this->page!=$this->pagenum){
$pagestr.="<ahref=".$url."p=".($this->page+1).">下一页</a>";

}
if($this->page+5<$this->pagenum){
$pagestr.="<ahref=".$url."p=".$this->pagenum.">尾页</a>";
}
return$pagestr;
}

}
//测试代码
$page=newpage(100,10);
$str=$page->getPage();
echo$str;


?>