ThinkPHP实现分页功能

class Page {
private $total; //数据表中总记录数
private $listRows; //每页显示行数
private $limit;
private $uri; //当前链接URL
private $pageNum; //页数
private $config=array('header'=>"个记录","prev"=>"上一页","next"=>"下一页","first"=>"首 页","last"=>"尾 页");
private $listNum=8; //限制页码列表数目

/*

• $total 总记录数
• $listRows 每页显示行数
  */
  public function __construct($total,$listRows=10,$pa=""){
  $this->total=$total; //数据表中总记录数
  $this->listRows=$listRows; //设置每页显示行数
  $this->uri=$this->getUri($pa); //请求地址
  $this->page=!empty($_GET["page"]) ? $_GET["page"] : 1; //当前页
  $this->pageNum=ceil($this->total/$this->listRows); //总页数
  $this->limit=$this->setLimit(); //限制每页长度
  }

private function setLimit(){
return "Limit ".($this->page-1)*$this->listRows.",{$this->listRows}";
}

//请求地址
private function getUri($pa){
$url=$_SERVER["REQUEST_URI"].(strpos($_SERVER["REQUEST_URI"],'?')?'':"?").$pa;
$parse=parse_url($url);

if(isset($parse["query"])){
  parse_str($parse['query'],$params);
  unset($params["page"]);
  $url=$parse['path'].'?'.http_build_query($params);

}

return $url;

}

function __get($args){
if($args=="limit")
return $this->limit;
else
return null;
}

//开始页，从哪一条显示
private function start(){
if($this->total==0)
return 0;
else
return ($this->page-1)*$this->listRows+1;
}

//从哪一条结束
private function end(){
return min($this->page*$this->listRows,$this->total);
}

//首页超链接
private function first(){
$html = "";
if($this->page==1)
$html.='';
else
$html.="uri}&page=1'>{$this->config["first"]}";

return $html;

}

//上一页
private function prev(){
$html = "";
if($this->page==1)
$html.='';
else
$html.="uri}&page=".($this->page-1)."'>{$this->config["prev"]}";

return $html;

}

//页码数字列表超链接
private function pageList(){
$linkPage="";

$inum=floor($this->listNum/2);

for($i=$inum; $i>=1; $i--){
  $page=$this->page-$i;

  if($page<1)
    continue;

  $linkPage.="<a href='{$this->uri}&page={$page}'>{$page}</a>";

}

$linkPage.="{$this->page}";


for($i=1; $i<=$inum; $i++){
  $page=$this->page+$i;
  if($page<=$this->pageNum)
    $linkPage.="<a href='{$this->uri}&page={$page}'>{$page}</a>";
  else
    break;
}

return $linkPage;

}

//下一页
private function next(){
$html = "";
if($this->page==$this->pageNum)
$html.='';
else
$html.="uri}&page=".($this->page+1)."'>{$this->config["next"]}";

return $html;

}

//尾页
private function last(){
$html = "";
if($this->page==$this->pageNum)
$html.='';
else
$html.="uri}&page=".($this->pageNum)."'>{$this->config["last"]}";

return $html;

}

//跳转
private function goPage(){
return '<input type="text" onkeydown="javascript:if(event.keyCode==13){var page=(this.value>'.$this->pageNum.')?'.$this->pageNum.':this.value;location=''.$this->uri.'&page='+page+''}" value="'.$this->page.'" style="width:25px"><input type="button" value="GO" onclick="javascript:var page=(this.previousSibling.value>'.$this->pageNum.')?'.$this->pageNum.':this.previousSibling.value;location=''.$this->uri.'&page='+page+''">';
}

//页码列表
function fpage($display=array(0,1,2,3,4,5,6,7,8)){
$html[0]="共有{$this->total}{$this->config["header"]}";
$html[1]="每页显示".($this->end()-$this->start()+1)."条，本页{$this->start()}-{$this->end()}条";
$html[2]="{$this->page}/{$this->pageNum}页";

$html[3]=$this->first();
$html[4]=$this->prev();
$html[5]=$this->pageList();
$html[6]=$this->next();
$html[7]=$this->last();
$html[8]=$this->goPage();
$fpage='';
foreach($display as $index){
  $fpage.=$html[$index];
}

return $fpage;

}

}

//实现分页效果
$goods = D('goods');

//① 获得数据的总记录条数
$total = $goods -> count(); //select count(*) from sw_goods;
$per = 7; //每页显示7条记录

//②实例化分页类
$page_obj = new ToolsPage($total,$per);

//③自定义sql语句，获取每页信息
$sql = "select * from sw_goods order by goods_id desc ".$page_obj->limit;
$info = $goods->query($sql);

//④获取页码列表
$pagelist = $page_obj->fpage(array(3,8));

//分配
$this->assign('pagelist',$pagelist);
$this->assign('info',$info);
$this->display();
}