显示页码，分页

<?php

error_reporting(E_ALL ^ E_NOTICE);

header('content-type:text/html;charset=utf-8');

//传入页码

$page=$_GET['p'];

//根据页码取出数据 php--->mysql处理

$host='localhost';

$username='root';

$password='root';

$db='shop';

$pageSize=5;

$showPage=5;

//连接数据库

$conn=mysql_connect($host,$username,$password);

if(!$conn){

echo '连接失败'.'<br/>';

//echo mysql_error();

exit;

}

//选择数据库

mysql_select_db($db);

//设置字符集编码

mysql_query('set names utf8');

//编写sql语句,获取数据

//$pageSize=10;

//$begin = ($page-1)*$pageSize;

//$final = $pageSize;

//$sql = "SELECT * FROM shop_admin LIMIT ".$begin.",".$final;

$sql="SELECT * FROM shop_admin LIMIT ".($page-1)*5 .",5";

//把sql语句传入数据库

$result=mysql_query($sql);

//var_dump($result);

//处理我们的数据

echo '<table border=1 cellspacing=0 width=40%>';

echo '<tr><td>ID</td><td>用户名</td><td>邮箱</td></tr>';

while($row = mysql_fetch_assoc($result)){

echo '<tr>';

echo "<td>{$row['id']}</td>";

echo "<td>{$row['username']}</td>";

echo "<td>{$row['email']}</td>";

echo '</tr>';

}

echo '</table>';

//释放结果msql_free_result($result);  关闭连接 mysql_close($result);

//获取数据总条数

$total_sql="select count(*) from shop_admin";

$total_result=mysql_fetch_array(mysql_query($total_sql));

$total=$total_result[0];

//echo $total;

//计算总页数

$total_pages=ceil($total/5);

//显示数据  加显示分页条

$page_banner="";

//计算偏移量

$pageoffset=($showPage-1)/2;

//初始化数据 

$star=1;

$end=$total_pages;

if($page>1){

$page_banner.="<a href='".$_SERVER['PHP_SELF']."?p=1'>首页</a>";

    $page_banner.="<a href='".$_SERVER['PHP_SELF']."?p=".($page-1)."'>上一页</a>";

}

if($total_pages>$showPage){

if($page>$pageoffset+1){

$page_banner="...";

}

}

if($page>$pageoffset){

$start=$page-$pageoffset;

$end=$total_pages>$page+$pageoffset?$page+$pageoffset:$total_pages;

}

if($page<$total_pages){

$page_banner.="<a href='".$_SERVER['PHP_SELF']."?p=".($page+1)."'>下一页</a>";

$page_banner.="<a href='".$_SERVER['PHP_SELF']."?p=".($total_pages)."'>尾页</a>";

}

$page_banner.="共{$total_pages}页,";

echo $page_banner;

?>