超强分页类

<?php
/**
*filename:ext_page.class.php
*@package:phpbean
*@author:feifengxlq<feifengxlq#gmail.com>
*@copyright:Copyright2006feifengxlq
*@license:version2.0
*@create:2006-5-31
*@modify:2006-6-1
*@modify:feifengxlq2006-11-4
*description:超强分页类，四种分页模式，默认采用类似baidu,google的分页风格。
*2.0增加功能：支持自定义风格，自定义样式，同时支持PHP4和PHP5,
*toseedetail,pleasevisithttp://www.phpobject.net/blog/read.php
*example:
*模式四种分页模式：
require_once('../libs/classes/page.class.php');
$page=newpage(array('total'=>1000,'perpage'=>20));
echo'mode:1<br>'.$page->show();
echo'<hr>mode:2<br>'.$page->show(2);
echo'<hr>mode:3<br>'.$page->show(3);
echo'<hr>mode:4<br>'.$page->show(4);
开启AJAX：
$ajaxpage=newpage(array('total'=>1000,'perpage'=>20,'ajax'=>'ajax_page','page_name'=>'test'));
echo'mode:1<br>'.$ajaxpage->show();
采用继承自定义分页显示模式：
demo:[url=http://www.phpobject.net/blog]http://www.phpobject.net/blog[/url]
*/
classpage
{
/**
*config,public
*/
var$page_name="PB_page";//page标签，用来控制url页。比如说xxx.php?PB_page=2中的PB_page
var$next_page='>';//下一页
var$pre_page='<';//上一页
var$first_page='First';//首页
var$last_page='Last';//尾页
var$pre_bar='<<';//上一分页条
var$next_bar='>>';//下一分页条
var$format_left='[';
var$format_right=']';
var$is_ajax=false;//是否支持AJAX分页模式

/**
*private
*
*/
var$pagebarnum=10;//控制记录条的个数。
var$totalpage=0;//总页数
var$ajax_action_name='';//AJAX动作名
var$nowindex=1;//当前页
var$url="";//url地址头
var$offset=0;

/**
*constructor构造函数
*
*@paramarray$array['total'],$array['perpage'],$array['nowindex'],$array['url'],$array['ajax']...
*/
functionpage($array)
{
if(is_array($array)){
if(!array_key_exists('total',$array))$this->error(__FUNCTION__,'needaparamoftotal');
$total=intval($array['total']);
$perpage=(array_key_exists('perpage',$array))?intval($array['perpage']):10;
$nowindex=(array_key_exists('nowindex',$array))?intval($array['nowindex']):'';
$url=(array_key_exists('url',$array))?$array['url']:'';
}else{
$total=$array;
$perpage=10;
$nowindex='';
$url='';
}
if((!is_int($total))||($total<0))$this->error(__FUNCTION__,$total.'isnotapositiveinteger!');
if((!is_int($perpage))||($perpage<=0))$this->error(__FUNCTION__,$perpage.'isnotapositiveinteger!');
if(!empty($array['page_name']))$this->set('page_name',$array['page_name']);//设置pagename
$this->_set_nowindex($nowindex);//设置当前页
$this->_set_url($url);//设置链接地址
$this->totalpage=ceil($total/$perpage);
$this->offset=($this->nowindex-1)*$perpage;
if(!empty($array['ajax']))$this->open_ajax($array['ajax']);//打开AJAX模式
}
/**
*设定类中指定变量名的值，如果改变量不属于这个类，将throw一个exception
*
*@paramstring$var
*@paramstring$value
*/
functionset($var,$value)
{
if(in_array($var,get_object_vars($this)))
$this->$var=$value;
else{
$this->error(__FUNCTION__,$var."doesnotbelongtoPB_Page!");
}

}
/**
*打开倒AJAX模式
*
*@paramstring$action默认ajax触发的动作。
*/
functionopen_ajax($action)
{
$this->is_ajax=true;
$this->ajax_action_name=$action;
}
/**
*获取显示"下一页"的代码
*
*@paramstring$style
*@returnstring
*/
functionnext_page($style='')
{
if($this->nowindex<$this->totalpage){
return$this->_get_link($this->_get_url($this->nowindex+1),$this->next_page,$style);
}
return'<spanclass="'.$style.'">'.$this->next_page.'</span>';
}

/**
*获取显示“上一页”的代码
*
*@paramstring$style
*@returnstring
*/
functionpre_page($style='')
{
if($this->nowindex>1){
return$this->_get_link($this->_get_url($this->nowindex-1),$this->pre_page,$style);
}
return'<spanclass="'.$style.'">'.$this->pre_page.'</span>';
}

/**
*获取显示“首页”的代码
*
*@returnstring
*/
functionfirst_page($style='')
{
if($this->nowindex==1){
return'<spanclass="'.$style.'">'.$this->first_page.'</span>';
}
return$this->_get_link($this->_get_url(1),$this->first_page,$style);
}

/**
*获取显示“尾页”的代码
*
*@returnstring
*/
functionlast_page($style='')
{
if($this->nowindex==$this->totalpage){
return'<spanclass="'.$style.'">'.$this->last_page.'</span>';
}
return$this->_get_link($this->_get_url($this->totalpage),$this->last_page,$style);
}

functionnowbar($style='',$nowindex_style='')
{
$plus=ceil($this->pagebarnum/2);
if($this->pagebarnum-$plus+$this->nowindex>$this->totalpage)$plus=($this->pagebarnum-$this->totalpage+$this->nowindex);
$begin=$this->nowindex-$plus+1;
$begin=($begin>=1)?$begin:1;
$return='';
for($i=$begin;$i<$begin+$this->pagebarnum;$i++)
{
if($i<=$this->totalpage){
if($i!=$this->nowindex)
$return.=$this->_get_text($this->_get_link($this->_get_url($i),$i,$style));
else
$return.=$this->_get_text('<spanclass="'.$nowindex_style.'">'.$i.'</span>');
}else{
break;
}
$return.=" ";
}
unset($begin);
return$return;
}
/**
*获取显示跳转按钮的代码
*
*@returnstring
*/
functionselect()
{
$return='<selectname="PB_Page_Select">';
for($i=1;$i<=$this->totalpage;$i++)
{
if($i==$this->nowindex){
$return.='<optionvalue="'.$i.'"selected>'.$i.'</option>';
}else{
$return.='<optionvalue="'.$i.'">'.$i.'</option>';
}
}
unset($i);
$return.='</select>';
return$return;
}

/**
*获取mysql语句中limit需要的值
*
*@returnstring
*/
functionoffset()
{
return$this->offset;
}

/**
*控制分页显示风格（你可以增加相应的风格）
*
*@paramint$mode
*@returnstring
*/
functionshow($mode=1)
{
switch($mode)
{
case'1':
$this->next_page='下一页';
$this->pre_page='上一页';
return$this->pre_page().$this->nowbar().$this->next_page().'第'.$this->select().'页';
break;
case'2':
$this->next_page='下一页';
$this->pre_page='上一页';
$this->first_page='首页';
$this->last_page='尾页';
return$this->first_page().$this->pre_page().'[第'.$this->nowindex.'页]'.$this->next_page().$this->last_page().'第'.$this->select().'页';
break;
case'3':
$this->next_page='下一页';
$this->pre_page='上一页';
$this->first_page='首页';
$this->last_page='尾页';
return$this->first_page().$this->pre_page().$this->next_page().$this->last_page();
break;
case'4':
$this->next_page='下一页';
$this->pre_page='上一页';
return$this->pre_page().$this->nowbar().$this->next_page();
break;
case'5':
return$this->pre_bar().$this->pre_page().$this->nowbar().$this->next_page().$this->next_bar();
break;
}

}
/*----------------privatefunction(私有方法)-----------------------------------------------------------*/
/**
*设置url头地址
*@param:String$url
*@returnboolean
*/
function_set_url($url="")
{
if(!empty($url)){
//手动设置
$this->url=$url.((stristr($url,'?'))?'&':'?').$this->page_name."=";
}else{
//自动获取
if(empty($_SERVER['QUERY_STRING'])){
//不存在QUERY_STRING时
$this->url=$_SERVER['REQUEST_URI']."?".$this->page_name."=";
}else{
//
if(stristr($_SERVER['QUERY_STRING'],$this->page_name.'=')){
//地址存在页面参数
$this->url=str_replace($this->page_name.'='.$this->nowindex,'',$_SERVER['REQUEST_URI']);
$last=$this->url[strlen($this->url)-1];
if($last=='?'||$last=='&'){
$this->url.=$this->page_name."=";
}else{
$this->url.='&'.$this->page_name."=";
}
}else{
//
$this->url=$_SERVER['REQUEST_URI'].'&'.$this->page_name.'=';
}//endif
}//endif
}//endif
}

/**
*设置当前页面
*
*/
function_set_nowindex($nowindex)
{
if(empty($nowindex)){
//系统获取

if(isset($_GET[$this->page_name])){
$this->nowindex=intval($_GET[$this->page_name]);
}
}else{
//手动设置
$this->nowindex=intval($nowindex);
}
}

/**
*为指定的页面返回地址值
*
*@paramint$pageno
*@returnstring$url
*/
function_get_url($pageno=1)
{
return$this->url.$pageno;
}

/**
*获取分页显示文字，比如说默认情况下_get_text('<ahref="">1</a>')将返回[<ahref="">1</a>]
*
*@paramString$str
*@returnstring$url
*/
function_get_text($str)
{
return$this->format_left.$str.$this->format_right;
}

/**
*获取链接地址
*/
function_get_link($url,$text,$style=''){
$style=(empty($style))?'':'class="'.$style.'"';
if($this->is_ajax){
//如果是使用AJAX模式
return'<a'.$style.'href="javascript:'.$this->ajax_action_name.'(''.$url.'')">'.$text.'</a>';
}else{
return'<a'.$style.'href="'.$url.'">'.$text.'</a>';
}
}
/**
*出错处理方式
*/
functionerror($function,$errormsg)
{
die('Errorinfile<b>'.__FILE__.'</b>,Function<b>'.$function.'()</b>:'.$errormsg);
}
}
?>