php pdo分页

 <table width="95%" border="1" cellspacing="0" cellpadding="0" align="center">
      <tr align="center" height="30px">
        <td>文章标题</td>
        <td>文章内容</td>
        <td>编辑</td>
      </tr>
 <?php

        try{
        header("content:text/html; charset:utf-8");
        include "conn/conn.php";

        if(@$_GET['page']!=""){
            $page=$_GET['page'];
        }else{
            $page=1;
        }
        if($page){
            $page_size=5;
            $query="select count(*) as total from tb_affiche";

            $result_acticle=$pdo->prepare($query);
            $result_acticle->execute();
            $msg_count =$result_acticle->rowCount($result_acticle,0,"total");
            $page_count=ceil($msg_count/$page_size);
            $offset=($page-1)*$page_size;
        $sql="SELECT * FROM tb_article order by now desc limit $offset,$page_size ";
        if(@$_POST['btnSea']=="查询"){
            $txtb= $_POST['txtbook'];
            $sql = "SELECT * FROM tb_article where title like '%".trim($txtb)."%' or  content like '%".trim($txtb)."%' order by now desc limit 5";

        }
        $result_acticle=$pdo->prepare($sql);
        $result_acticle->execute();

        while($res_article=$result_acticle->fetch(PDO::FETCH_ASSOC)){
            ?>
          <tr height="30px">
        <td align="center"><?php echo $res_article['title']; ?></td>
        <td>&nbsp;<?php echo $res_article['content']; ?></td>
        <td width="50px" align="center"><a href="modify.php?id='<?php echo $res_article['id']; ?>'">编辑</a></td>
        <td width="50px" align="center"><a href="delete.php?id='<?php echo $res_article['id']; ?>'">删除</a></td>
      </tr>  

            <?php
        }
        }

        }catch(Exception $ex){
            echo $ex->getMessage();
        }
?>
</table>
<table align="center" width="600" border="0" cellspacing="0" cellpadding="0">
      <tr>
        <td>页次:<?php echo $page?>/<?php echo $page_count?>页&nbsp;记录:<?php echo $msg_count?>条</td>
        <td>&nbsp;</td>

        <td width="40px"><a href="edit.php?page=1">首页</a></td>
        <td width="45px"><a href="edit.php?page=<?php
        if($page==1){
            echo "1";
        }else{
             echo $page-1;
        }
         ?>">上一页</a></td>

        <td width="45px"><a href="edit.php?page=<?php
        if($page==$page_count){
            echo $page_count;
        }else{
            echo $page+1;
        }
        ?>">下一页</a></td>
        <td width="40px"><a href="edit.php?page=<?php echo $page_count?>">尾页</a></td>
      </tr>
    </table>