php分页类

实例：
  $page = new ShowPage;
  $page->PageSize = 20;//每页数
  $page->Total = 100;//记录总数
  echo $page->ShowLink();
*****/
class ShowPage {
  
var $PageSize;     //每页显示的记录数

var $Total;        //记录总数

var $LinkAry;      //Url参数数组，对于复合条件查询分页显示情况非常好用

//取得总页数
function PageCount() {
  $TotalPage = ceil($this->Total / $this->PageSize);
  return $TotalPage;
  }
//取得当前页
function PageNum() {
  $page =  (isset( $_GET['page'])!="") ? $_GET['page'] :  $page = 1;
  return $page;
}
//查询语句定位指针  
function OffSet() {
  if ($this->PageNum() > $this->PageCount()) {
         //$this->PageNum = $this->PageCount();
         $pagemin = max(0,$this->Total - $this->PageSize - 1);
        }else if ($this->PageNum() == 1){
          $pagemin = 0;
         }else {
          $pagemin = min($this->Total - 1,$this->PageSize * ($this->PageNum() - 1));
           }
  return $pagemin . "," . $this->PageSize;
     }
//定位首页  
function FristPage() {
  $Frist = ($this->PageNum() Url($this->LinkAry)."\">首页 ";
  return $Frist;
}
//定位上一页
function PrePage() {
  $prepage=$this->PageNum() - 1;
  $Previous = ($this->PageNum() >= 2) ? " Url($this->LinkAry)."\">上一页 " : "上一页 ";
  return $Previous;
}
//定位下一页
function NextPage() {
  $nextpage = $this->PageNum() + 1;
  $Next = ($this->PageNum() PageCount()-1) ? " Url($this->LinkAry)."\">下一页 " : "下一页 ";
  return $Next;
}
//定位最后一页
function LastPage() {
  $Last = ($this->PageNum() >= $this->PageCount()) ? "尾页  " : " PageCount().$this->Url($this->LinkAry)."\">尾页 ";
  return $Last;
}
//下拉跳转页面
function JumpPage() {
  $Jump = " 当前第 ".$this->PageNum()." 页  共 ".$this->PageCount()." 页 跳到 ";
  for ($i=1; $iPageCount(); $i++) {
  if ($i==$this->PageNum())
   $Jump .= "Url($this->LinkAry)."\" selected>$i";
  else
   $Jump .="Url($this->LinkAry)."\">$i ";
  }
     $Jump .= " 页";
  return $Jump;
}
//URL参数处理
function Url($ary) {
  $Linkstr = "";
  if (count($ary) > 0) {
   foreach ($ary as $key => $val) {
   $Linkstr .= "&".$key."=".$val;
   }
  }
  return $Linkstr;
}
//生成导航条
function ShowLink() {
  return $this->FristPage().$this->PrePage().$this->NextPage().$this->LastPage().$this->JumpPage();
}
}
?>