用php制作简单分页(从数据库读取记录)的方法详解

$conn = mysql_connect('localhost','root','');
            mysql_select_db('db_BookStore',$conn);
            mysql_query("set names utf8");
            if(isset($_GET['page']))                   //判断是否存在page参数,获得页面值，否则取1
            {
                $page = intval($_GET['page']);
            }
            else
            {
                $page = 1;
            }
            $page_size = 2; //最大记录条数
            $sql = "SELECT count(*) as amount FROM tb_BookInfo";
            $result = mysql_query($sql);
            $row = mysql_fetch_array($result);
            //计算总页数
            $amount = $row['amount'];
            if($amount)
            {
                if($amount < $page_size){$page_count = 1;}
                if($amount % $page_size){$page_count = (int)($amount / $page_size) + 1; }
                else{$page_count = $amount / $page_size;}
            }
            else
            {
                $page_count = 0;
            }
            //翻页链接
            $page_string = "";
            if($page == 1)
            {
                $page_string .= "首页 | 上一页";
            }
            else
            {
                $page_string .= "<a href='?page=1'>首页</a> | <a href='?page=".($page-1)."'>上一页</a>";
            }
            $page_string .= "| $page |";
            if($page == $page_count)
            {
                $page_string .= "下一页 | 尾页";
            }
            else
            {
                $page_string .= "<a href='?page=".($page+1)."'>下一页</a> | <a href='?page=$page_count'>尾页</a>";
            }
　　        $sql = "select * from table order by id desc limit ". ($page-1)*$page_size .", $page_size";
　        　$result = mysql_query($sql);
　　　　　　 while ( $row = mysql_fetch_row($result) ){
　　　　　　　　　$rowset[] = $row;
　　　　　　　}
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