类似百度的分页类

<?
#54683213468435132138454312.21354165
#Explain:  类似百度的分页类
#Author : 侏罗记
#Date   :2007-12-19
#MAIL   :[email protected]
#54683213468435132138454312.21354165
class page
{
private $number;  //每页显示信息条数
private $ossSet; //偏移量
private $msgNum; //信息总条数
private $url;  //传出url
public function __construct($number,$offSet,$msgNum,$url)
{
  $this->number = $number;
  $this->offSet = $offSet;
  $this->msgNum = $msgNum;
  $this->url    = $url;
}

public  function pages()
{
  //页码偏移量
  $pageSet = '9';
  if(empty($this->offSet))
  {
   $offSet = '0';
  }
  // 计算总页数
  $pageNum = intval($this->msgNum/$this->number);
 
  //计算当前页码
  $page = ($this->offSet/$this->number) > '0' ? ($this->offSet/$this->number) : '1';
  // 计算起始页码
  if($page < '11')
  {
   $startPageNum = '1';
  }
  else
  {
   $startPageNum = $page - $pageSet;
  }
  //计算结束页码
  $endPageNum = $page+$pageSet;
  if($endPageNum > $pageNum)
  {
   $endPageNum = $pageNum;
  } 
  $pos  = $this->offSet - $this->number;
  $next = $this->offSet + $this->number;
  if($pos < '0')
  {
   $pos = '0';
  }
  if($next > $this->msgNum)
  {
   $next = $this->msgNum;
  }
  //上一页
  $upPage = "<a href=".$this->url."?page=".$pos.">上一页</a>";
  //下一页
  $nextPage = "<a href=".$this->url."?page=".$next.">下一页</a>";
  //构成页码 123....789
  $string = "";
  for($f=$startPageNum;$f<=$endPageNum;$f++)
  {
   if($f == $page)
   {
    $string .= $f;
   }
   else
   {
   $string .= "<a href=".$this->url.'?page='.($f*$this->number).">[".$f."]</a>";
   }
  }
 
  //输出页码
  echo $upPage.$string.$nextPage;
}
}
/************使用方法*************/
$offSet = $_GET['page'];
$page = new page(10,$offSet,200,'page_class.php');
$page->pages();
?>