分页类

<?php
//
// +----------------------------------------------------------------------+
// | 分页类                                                               |
// +----------------------------------------------------------------------+
// | Copyright (c) 2001 NetFish Software                                  |
// |                                                                      |
// | Author: whxbb([email protected])                                       |
// +----------------------------------------------------------------------+
//
// $Id: pager.class.php,v 0.1 2001/8/2 13:18:13 yf Exp $
//
// 禁止直接访问该页面
if (basename($HTTP_SERVER_VARS['PHP_SELF']) == "pager.class.php") {
header("HTTP/1.0 404 Not Found");
}
/**
* 分页类
* Purpose
* 分页
*
* @author  : whxbb([email protected])
* @version : 0.1
* @date    :  2001/8/2
*/
class Pager
{
/** 总信息数 */
var $infoCount;
/** 总页数 */
var $pageCount;
/** 每页显示条数　*/
var $items;
/** 当前页码 */
var $pageNo;
/** 查询的起始位置　*/
var $startPos;
var $nextPageNo;
var $prevPageNo;

function Pager($infoCount, $items, $pageNo)
{
$this->infoCount = $infoCount;
$this->items     = $items;
$this->pageNo    = $pageNo;
$this->pageCount = $this->GetPageCount();
$this->AdjustPageNo();
$this->startPos  = $this->GetStartPos();
}
function AdjustPageNo()
{
if($this->pageNo == '' || $this->pageNo <1)
$this->pageNo = 1;
if ($this->pageNo > $this->pageCount)
$this->pageNo = $this->pageCount;
}
/**
* 下一页
*/
function GoToNextPage()
{
$nextPageNo = $this->pageNo + 1;
if ($nextPageNo > $this->pageCount)
{
$this->nextPageNo = $this->pageCount;
return false;
}
$this->nextPageNo = $nextPageNo;
return true;
}
/**
* 上一页
*/
function GotoPrevPage()
{
$prevPageNo = $this->pageNo - 1;
if ($prevPageNo <1)
{
$this->prevPageNo = 1;
return false;
}
$this->prevPageNo = $prevPageNo;
return true;
}
function GetPageCount()
{
return ceil($this->infoCount / $this->items);
}
function GetStartPos()
{
return ($this->pageNo - 1)  * $this->items;
}
}
?>