<?php
/*
** File: class.pagenumber.php
** Class: PageNumber
** Version: none
** Created: 5/12/2004
** Author: Morgan Woo
** Email: morgan.woo@163.com
** Update:huabing lv
** Email:hb_lv@hotmail.com
**
** Copyright (c) 2004 Mr.Woo .  All rights reserved.
*/
class Pager{
   //生成的页码（事实上不用也行）
   var $pageNumber='';
   
   //需要分类的条目总数
    var $totalItems=0;
    //数据连接相关
   var $conn;
   var $sql;
   //每页显示几个条目
   var $itemsPerPage=3;
   
   //总页数
   var $totalPageNumber=0;
   //当前页码！
   var   $currentPageNumber=1;
   
   //一个页面显示几个页码
   var $length=10;
   
   
   //需要分页的url
   var $url='';
   function Pager($conn,$sql,$currentPageNumber,$itemsPerPage,$length,$url){
     $this->currentPageNumber=$currentPageNumber;
       $this->conn=$conn;
       $this->sql=$sql;
        $this->itemsPerPage=$itemsPerPage;
         $this->length=$length;
  $this->url=$url;
  $this->url.=(stristr($this->url,'?')!=false)?'&':'?';  //Url里有"?"就加"&"没有就加"?"
  $this->getTotalPageNumber();
   }
    function getTotalItems(){
     //for adodb
     $rs=$this->conn->Execute($this->sql);
     $this->totalItems=$rs->RecordCount();
     return $this->totalItems;
    }
     function getTotalPageNumber(){
      $this->totalPageNumber=ceil($this->getTotalItems()/$this->itemsPerPage);  
 return $this->totalPageNumber;
   }

   //SQL里 LIMIT start，length 中的起始值
   function getLimitStart(){
      $start=($this->currentPageNumber-1)*$this->itemsPerPage;
      return $start;
   }
   //SQL里 LIMIT start，length 中的length
   function getLimitItems(){
      return $this->itemsPerPage;
   }
   function getRsPerPage(){
     $modiSQL=$this->sql." limit ".$this->getLimitStart()." ,".$this->getLimitItems();
//偶用的是adodb的说
     $modiRS=$this->conn->Execute($modiSQL);
     $arr=$modiRS->GetArray();
     return $arr;
   }

   //主函数.中文分页
   function getPageNumber(){
      if ($this->getTotalPageNumber()>1){
         
         $pageNumber='当前第'.$this->currentPageNumber.'页/共'.$this->totalPageNumber.'页';
          //显示第一页和前一页
         if ($this->currentPageNumber>1){
    //第一页
            //First Page
            $pageNumber.="<B><A HREF=".$this->url."page=1>第一页</A> </B> ";
   //前一页
            //Previous Page
            $pageNumber.="<B><A HREF=".$this->url."page=".($this->currentPageNumber-1).">前一页</A> </B>";
         }
         //The start number is the first number of all pages which show on the current page.
         $startNumber=intval($this->currentPageNumber/$this->length)*$this->length;
         //Prev N page
   //交界处
         if ($this->currentPageNumber>=$this->length){
            $pageNumber.="[<B><A HREF=".$this->url."page=".($startNumber-1).">".($startNumber-1)."</A></B>]...";
         }
         
         $leftPageNumber=0;
         for ($i=$startNumber;$i<=$this->totalPageNumber;$i++){
            if ($i==0)continue;
            if ($i-$startNumber<$this->length){
               if ($i==$this->currentPageNumber){
                  $pageNumber.="[<b>$i</b>]";
               }else{
                  $pageNumber.="[<A HREF=".$this->url."page=".$i.">".$i."</A>]";
               }
            }else{
               $leftPageNumber=$this->totalPageNumber-$i+1;
               break;
            }
         }
   //显示下一个分页列表
         if ($leftPageNumber>=1){
            $pageNumber.="...[<B><A HREF=".$this->url."page=".($startNumber+$this->length).">".($startNumber+$this->length)."</A></B>] ";
         }
         
         if ($this->currentPageNumber!=$this->totalPageNumber){
            //Next page
            $pageNumber.="<B><A HREF=".$this->url."page=".($this->currentPageNumber+1).">下一页</A> </B>";
            //Last page
            $pageNumber.="<B><A HREF=".$this->url."page=".$this->totalPageNumber.">最后页</A> </B>";
         }
         
         $this->pageNumber=$pageNumber;
         return $this->pageNumber;
         
      }
      
      
   }
   
 
//英文分页
function getPageNumber2(){
      if ($this->getTotalPageNumber()>1){
         
         $pageNumber='P'.$this->currentPageNumber.'/'.$this->totalPageNumber.'';
          //显示第一页和前一页
         if ($this->currentPageNumber>1){
    //第一页
            //First Page
            $pageNumber.="<B><A HREF=".$this->url."page=1>FIRST</A> </B> ";
   //前一页
            //Previous Page
            $pageNumber.="<B><A HREF=".$this->url."page=".($this->currentPageNumber-1).">PREV</A> </B>";
         }
         //The start number is the first number of all pages which show on the current page.
         $startNumber=intval($this->currentPageNumber/$this->length)*$this->length;
         //Prev N page
   //交界处
         if ($this->currentPageNumber>=$this->length){
            $pageNumber.="[<B><A HREF=".$this->url."page=".($startNumber-1).">".($startNumber-1)."</A></B>]...";
         }
         
         $leftPageNumber=0;
         for ($i=$startNumber;$i<=$this->totalPageNumber;$i++){
            if ($i==0)continue;
            if ($i-$startNumber<$this->length){
               if ($i==$this->currentPageNumber){
                  $pageNumber.="[<b>$i</b>]";
               }else{
                  $pageNumber.="[<A HREF=".$this->url."page=".$i.">".$i."</A>]";
               }
            }else{
               $leftPageNumber=$this->totalPageNumber-$i+1;
               break;
            }
         }
   //显示下一个分页列表
         if ($leftPageNumber>=1){
            $pageNumber.="...[<B><A HREF=".$this->url."page=".($startNumber+$this->length).">".($startNumber+$this->length)."</A></B>] ";
         }
         
         if ($this->currentPageNumber!=$this->totalPageNumber){
            //Next page
            $pageNumber.="<B><A HREF=".$this->url."page=".($this->currentPageNumber+1).">NEXT</A> </B>";
            //Last page
            $pageNumber.="<B><A HREF=".$this->url."page=".$this->totalPageNumber.">LAST</A>  </B>";
         }
         
         $this->pageNumber=$pageNumber;
         return $this->pageNumber;
         
      }
      
      
   }
   
}
//$currentPageNumber=( isset($_GET['page']) ) ? intval($_GET['page']) : 1;
//include("PAGENUMBER/class.pagenumber.php");
//$pageNumber= new PageNumber($adodbConn,$sql,$currentPageNumber,10,3,3,"test.php");
//echo $pageNumber->getPageNumber2();
//echo "<br>";
//echo $pageNumber->getPageNumber();
?>