php分页

<?php
    /*
    分页类 用于实现对多条数据分页显示　
    version：1.0
    author：Knight
    E-Mail：S.Knight.Work@gmail.com
    Date：2013-10-20
    */
    
    /*
        调用非常方便，先连接好数据库，直接传人查询的sql字符串即可，也可以指定每页显示的数据条数
        例如$pages = new Page('SELECT * FROM `zy_common_member`');
        或  $pages = new Page('SELECT * FROM `zy_common_member`', 10);
    */
    class Page{
        private $curPage;
        private $totalPages;//数据总共分多少页显示
        private $dispNum;//每页显示的数据条数
        private $queryStr;//查询的SQL语句
        private $limitStr;//查询语句后面的limit控制语句
        
        /*
        构造函数
        $queryStr 查询数据的SQL语句
        $dispNum  每页显示的数据条数
        */
        public function __construct($queryStr='',$dispNum=10){    
            $result = mysql_query($queryStr);
            $totalNum = mysql_num_rows($result);
            $this->dispNum = $dispNum;
            $this->totalPages = ceil($totalNum / $dispNum);
            $this->queryStr = $queryStr;
            
            $temp = (isset($_GET["curPage"]) ? $_GET["curPage"] : 1);
            $this->setCurPage($temp);
            
            $this->showCurPage();
            $this->showFoot();
        }        
        
        /*显示当前页的数据内容*/
        private function showCurPage(){
            $this->limitStr = ' LIMIT '.(($this->curPage - 1)* $this->dispNum).','.$this->dispNum;
            //echo $this->queryStr.$this->limitStr;
            $result = mysql_query($this->queryStr.$this->limitStr);
            
            if (!$result)
            {            
                if ($this->totalPages > 0)
                {
                    echo '查询出错'.'<br>';
                }
                else
                {
                    echo '无数据'.'<br>';
                }
                return;
            }
            $cols = mysql_num_fields($result);
        
            echo '<table border="1">';
            echo '<tr>';
            for($i=0; $i<$cols; $i++)
            {
                echo '<th>';
                echo mysql_field_name($result, $i);
                echo '</th>';
            }
            echo '</tr>';
        
            while($row = mysql_fetch_assoc($result))
            {
                echo '<tr>';
                foreach($row as $key=>$value)
                {
                    echo '<td>';
                    echo $value;
                    echo '</td>';
                }
                echo '</tr>';
            }
            
            echo '</table>';
        }
        
        private function setCurPage($curPage){
                if($curPage < 1)
                {
                    $curPage = 1;
                }
                else if($curPage > $this->totalPages)
                {
                    $curPage = $this->totalPages;
                }
                    $this->curPage = $curPage;
        }
 
        /*
        显示分页页脚的信息
        如首页，上一页，下一页，尾页等信息
        */
        private function showFoot(){
            echo '<a href="?curPage=1">首页</a>';
            echo '<a href="?curPage='.($this->curPage - 1).'">上一页</a>';
            echo '<a href="?curPage='.($this->curPage + 1).'">下一页</a>';
            echo '<a href="?curPage='.$this->totalPages.'">尾页</a>';
        }
 
  }
    
?>