php搜索加分页

$wherelist=array();
$urlist=array();
if(!empty($_GET[\'title\']))
{
$wherelist[]=" title like \'%".$_GET[\'title\']."%\'";
$urllist[]="title=".$_GET[\'title\'];

}
if(!empty($_GET[\'keywords\']))
{
$wherelist[]=" keywords like \'%".$_GET[\'keywords\']."%\'";
$urllist[]="keywords=".$_GET[\'keywords\'];
}if(!empty($_GET[\'author\']))
{
$wherelist[]=" author like \'%".$_GET[\'author\']."%\'";
$urllist[]="author=".$_GET[\'author\'];
}
$where="";
if(count($wherelist)>0)
{
$where=" where ".implode(\' and \',$wherelist);
$url=\'&\'.implode(\'&\',$urllist);
}
//分页的实现原理
//1.获取数据表中总记录数
$sql="select count(*) from news $where ";
$result=mysql_query($sql);
$totalnum=mysql_num_rows($result);
//每页显示条数
$pagesize=5;
//总共有几页
$maxpage=ceil($totalnum/$pagesize);
$page=isset($_GET[\'page\'])?$_GET[\'page\']:1;
if($page <1)
{
$page=1;
}
if($page>$maxpage)
{
$page=$maxpage;
}
$limit=" limit ".($page-1)*$pagesize.",$pagesize";
$sql1="select * from news {$where} {$limit}";

//$sql1="select * from news {$where} {$limit}";
$res=mysql_query($sql1);

?>
<form action="searchpage.php" method="get">
标题：<input type="text" name="title" value="<?php echo $_GET[\'title\']?>" size="8">
关键字<input type="text" name="keywords" value="<?php echo $_GET[\'keywords\']?>" size="8">
作者：<input type="text" name="author" value="<?php echo $_GET[\'author\']?>" size="8">
    <input type="button" value="查看全部" onclick="window.location=\'searchpage.php\'">
    <input type="submit" value="搜索">
</form>

<table border="1" width="1000" align="center">
    <tr>
        <td>编号</td>
        <td>标题</td>
        <td>关键字</td>
        <td>作者</td>
        <td>日期</td>
        <td>内容</td>
    </tr>
<?php while($row= mysql_fetch_assoc($res)){?>
<tr>
            <td><?php echo $row[\'id\'] ?></td>
            <td><?php echo $row[\'title\'] ?></td>
            <td><?php echo $row[\'keywords\'] ?></td>
            <td><?php echo $row[\'author\'] ?></td>
            <td><?php echo date("Y-m-d H:i:s",$row[\'addtime\']) ?></td>
            <td><?php echo $row[\'content\'] ?></td>
        </tr>
<?php }?>
<tr>
        <td colspan="6">
<?php
            echo " 当前{$page}/{$maxpage}页 共{$totalnum}条";
echo " <a href=\'searchpage.php?page=1{$url}\'>首页</a> ";
echo "<a href=\'searchpage.php?page=".($page-1)."{$url}\'>上一页</a>";
echo "<a href=\'searchpage.php?page=".($page+1)."{$url}\'>下一页</a>";
echo " <a href=\'searchpage.php?page={$maxpage}{$url}\'>尾页</a> ";

?>
</td>
    </tr>
</table>