一个通用php分页类

<?php
/**
 * 后台通用分页类
 */
class Pager
{
    //public
    public $firstPage;
    public $endPage;
    public $lastPage;
    public $nextPage;
    public $thisPage;
    public $pageSize;
    public $rowNum;
    public $listNum;
    public $cssClass;
    public $splitStr;
    public $pageLast;
    public $pageNext;
    public $pageFirst;
    public $pageEnd;
    public $pageList;
    public $pageSelect;
    public $pageAll;
    public $links;
    
    function __construct($rowNum,$pageSize = '20',$listNum = '8')
    {
        $this->cssClass = 'current';
        $this->rowNum = $rowNum;
        $this->pageSize = $pageSize;
        $this->listNum = $listNum;
        $this->splitStr = '&nbsp;&nbsp;';
        $this->lastPage = '上一页';
        $this->nextPage = '下一页';
        $this->firstPage = '首页';
        $this->endPage = '末页';
        $this->thisPage = $_GET['page'] > 0 ? $_GET['page'] : 1;
    }
    
    function getStrWhere()
    {
        $temp = array();
        foreach ($_GET as $key=>$val)
            if($key != 'page') $temp[] = urlencode($key) . '=' . urlencode($val);
        foreach ($_POST as $key=>$val)
            $temp[] = urlencode($key) . '=' . urlencode($val);
        $str = implode('&',$temp);
        unset($temp);
        return $str;
    }
    
    function getPageNum()
    {
        if ($this->thisPage < 1)
            $this->thisPage = 1;
        if ($this->rowNum < 1)
            return 1;
        return ceil($this->rowNum/$this->pageSize);
    }
    
    function createSelect($s,$e)
    {
        $temp = array();
        $temp[] = '<select class="'.$this->cssClass.'" onchange="window.location=this.options[this.selectedIndex].value">';
        for($i = $s ; $i <= $e;$i ++)
            $temp[] = '<option value="?page='.$i.''.$this->getStrWhere().'" '.(($i == $this->thisPage)?'selected':'').'>'.$i;
        $temp[] = '<select>';
        return implode(chr(13),$temp);     
    }
    
    function createPage()
    {
        $strWhere = $this->getStrWhere();
        $lastPage = $this->lastPage;
        $firstPage = $this->firstPage;
        $endPage = $this->endPage;
        $nextPage = $this->nextPage;
        $thisPage = $this->thisPage;
        $pageNum = $this->getPageNum();
        $listNum = $this->listNum;

        $startNum = $thisPage - (ceil($listNum)-1);
        if ($startNum < 1 ) $startNum = 1;
        $endNum = $startNum + $listNum - 1;
        if ($endNum > $pageNum) $endNum = $pageNum;
        
    
        $this->links['first'] ='?'.$strWhere.'&page=1';
        $this->links['last'] ='?'.$strWhere.'&page='.(($thisPage-1<1)?1:($thisPage-1));
        $this->links['next'] ='?'.$strWhere.'&page='.(($thisPage+1>$pageNum)?$pageNum:($thisPage+1));
        $this->links['end'] ='?'.$strWhere.'&page='.$pageNum;
        $this->pageFirst = '<a href="'.$this->links['first'].'" class="'.$this->cssClass.'">'.$firstPage.'</a>'.$this->splitStr;
        $this->pageLast = '<a href="'.$this->links['last'].'" class="'.$this->cssClass.'">'.$lastPage.'</a>';
        $this->pageNext = '<a href="'.$this->links['next'].'" class="'.$this->cssClass.'">'.$nextPage.'</a>';
        $this->pageEnd = $this->splitStr.'<a href="'.$this->links['end'].'" class="'.$this->cssClass.'">'.$endPage.'</a>';
        
        $pageList;
        
        for($i = $startNum ; $i <= $endNum ; $i ++)
            if ($thisPage != $i)
                $pageList[] = '<a href="?'.$strWhere.'&page='.$i.'" class="'.$this->cssClass.'">'.$i.'</a>';
            else
                $pageList[] = '<a class="'.$this->cssClass.'"><b>'.$i.'</b></a>';
        $this->pageList = implode($this->splitStr,$pageList);
        $this->pageSelect = $this->createSelect($startNum,$endNum);
        //带跳转
        //$this->pageAll = $this->pageFirst.$this->splitStr.$this->pageLast.$this->splitStr.$this->pageList.$this->splitStr.$this->pageNext.$this->splitStr.$this->pageEnd.$this->splitStr.$this->pageSelect;
        //不带跳转
        $this->pageAll = $this->pageFirst.$this->splitStr.$this->pageLast.$this->splitStr.$this->pageList.$this->splitStr.$this->pageNext.$this->splitStr.$this->pageEnd.$this->splitStr;
        return $this->pageAll;
    }
}
?>

#demo
  $total = 100;
  $pageSize = 20;
  $obj = new Pager($total,$pageSize);
  $obj->createPage();