php+mysql 实现分页

<?php
header(‘content-type:text/html;charset=utf-8‘);
	include(‘./sqldb.php‘);
	$sql="select * from test order by id desc";
	$result=mysql_query($sql);
	$num=mysql_num_rows($result);                	//页总数
	$pageSize=5;  									//页尺寸
	$pageCount=ceil($num/$pageSize);				//总页数
	$pageNo=isset($_GET[‘page‘])?$_GET[‘page‘]:1; 	//页码
	$pageNext=$pageNo+1;							//下一页
	$pagePrev=$pageNo-1;							//上一页
	
	//判断页码越界
	if($pageNext>$pageCount)  $pageNext=$pageCount;
	if($pagePrev<1) 		  $pagePrev=1;
	if($pageNo>$pageCount)    $pageNo=$pageCount;
	if($pageNo<1)			  $pageNo=1;

	$offset=($pageNo-1)*$pageSize;       			//偏移量  
	mysql_data_seek($result, $offset);				//将结果指针移至offset处
?>

<style type="text/css">
	tr{background-color:#ffffff; font-size:12px;}
	td{text-align:center;height:30px;}

</style>
<table width="100%;" bgcolor="#333666" cellspacing="1">
	<tr>
		<td>ID</td>
		<td>姓名</td>
		<td>权限</td>
	</tr>
	<tr>
	<?php
    
    for ($i=0; $i <$pageSize ; $i++):
		$row=mysql_fetch_assoc($result);
		 if ($row) :
?>
		<td><?php echo $row[‘id‘]?></td>
		<td><?php echo $row[‘name‘]?></td>
		<td>
				<?php

				switch ($row[‘flag‘]) {
				case ‘1‘:
					echo "老师";
					break;
				case ‘2‘:
					echo "教授";
					break;
				
				default:
					echo "学生";
					break;
			}


		?>
</td>
	</tr>

	<?php
		endif;
	endfor;
	?>
	<tr>
		<td colspan="3">
			共<?php echo $num ?>条
			共<?php echo $pageCount ?> 页
			每页 <?php echo $pageSize ?>条
			<a href="Page.class.php?page=1">首页</a>
			<a href="Page.class.php?page=<?php echo $pagePrev ?> ">第一页</a>
			<a href="Page.class.php?page=<?php echo $pageNext?>">下一页</a>
			<a href="Page.class.php?page=<?php echo $pageCount?>">最后一页</a>

		</td>
	</tr>

</table>