简单php分页

该分页类是一个简单的分页类 可能会有不对的地方。

<?php
//==============分页类的实现===============
/*
 *@param 
 *$pageSize    每页大小
 *$sumRecord   总记录条数
 *$sumPage     总页数
 *$currentPage 当前页数
 *$url         页面的url地址
 */


class Page{


    private $pageSize;
    private $sumRecord;
    private $sumPage;
    private $currentPage;
    private $url;
  


    public function __construct($sumRecord, $pageSize, $currentPage)
    {
$this->pageSize    = $pageSize;
$this->sumRecord   = $sumRecord;
$this->currentPage = $currentPage;


$this->sumPage = ceil($this->sumRecord/$this->pageSize);
$this->getUrl();
    }
    
    private function first()   //首页
    {
if($this->currentPage !=1 ){
   return "<a href='".$this->url."1'>首页</a>\n";
} else {
   return "首页\n";
}
    }


    private function prevPage()//上一页
    {
if($this->currentPage > 1){
   return "<a href='".$this->url.($this->currentPage-1)."'>上一页</a>\n";
} else {
   return "上一页\n";
}
    }


    private function postPage()//下一页
    {
if($this->currentPage < $this->sumPage){
   return "<a href='".$this->url.($this->currentPage+1)."'>下一页</a>\n";
} else {
   return "下一页\n";
}
    }


    private function last()   //尾页
    {
if($this->currentPage != $this->sumPage){
   return "<a href='".$this->url.$this->sumPage."'>尾页</a>\n";
} else {
   return "尾页\n";
}
    }
    
    private function getUrl()
    {
$url   = $_SERVER['REQUEST_URI'];
$param = parse_url($url);


if(isset($param['query'])) {
   parse_str($param['query'],$query);
  
   unset($query['page']);
   if(count($query)) {
$this->url = $param['path']."?".http_build_query($query)."&page=";
   } else {
$this->url = $param['path']."?page=";
   }
} else {
   $this->url = $param['path']."?page=";
}
    }


    public function showPaging()
    {
$str = "第{$this->currentPage}/{$this->sumPage}页 共{$this->sumRecord}条记录\n";
$str .= $this->first();
$str .= $this->prevPage();
$str .= $this->postPage();
$str .= $this->last();
echo $str;
    }
}

// 测试例子
$page  = isset($_GET['page'])? $_GET['page']: 1;


$pager = new Page(101, 20, $page);
$pager->showPaging();
echo "<br/>";
?>