本文详细介绍本人最近做的一个PHP留言板（PHP在线咨询留言系统）
主要功能：
留言，回复，注册，管理。
技术细节：
1.注册与登录页面无刷新（AJAX）验证；
2.一条留言下可显示多条回复（一个原创的算法）；
3.留言分页显示；4.留言管理（删除）；
5.页面布局（HTML+DIV+CSS）；
6.PHP操作MySQL数据库。
要使用此留言板，必须先创建数据库，而且MySQL账号设置为root,密码为root（或者自行修改多个php文件中默认的账号和密码）。数据库弄好之后，把“留言板-zollty”文件夹放到网站目录下，访问http://localhost/mb-zollty/index.php即可。
为方便大家使用，下面给出一个数据库备份文件guestbook.txt，你只需要恢复该数据库即可，恢复方式：
【在DOS下，输入: mysql -u用户名 -p密码 guestbook <F:\guestbook.txt（备份文件所在位置）】
guestbook.txt内容如下：
-- MySQL dump 10.11
--
-- Host: localhost Database: guestbook
-- ------------------------------------------------------
-- Server version 5.0.51b-community-nt-log
/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;
/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
/*!40103 SET TIME_ZONE='+00:00' */;
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
--
-- Table structure for table `admin`
--
DROP TABLE IF EXISTS `admin`;
SET @saved_cs_client = @@character_set_client;
SET character_set_client = utf8;
CREATE TABLE `admin` (
`name` varchar(16) NOT NULL COMMENT '管理名称',
`pwd` varchar(32) NOT NULL COMMENT '管理员密码',
PRIMARY KEY (`name`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
SET character_set_client = @saved_cs_client;
--
-- Dumping data for table `admin`
--
LOCK TABLES `admin` WRITE;
/*!40000 ALTER TABLE `admin` DISABLE KEYS */;
INSERT INTO `admin` VALUES ('zollty','e10adc3949ba59abbe56e057f20f883e'),('tester','e10adc3949ba59abbe56e057f20f883e');
/*!40000 ALTER TABLE `admin` ENABLE KEYS */;
UNLOCK TABLES;
--
-- Table structure for table `guest`
--
DROP TABLE IF EXISTS `guest`;
SET @saved_cs_client = @@character_set_client;
SET character_set_client = utf8;
CREATE TABLE `guest` (
`id` int(11) NOT NULL auto_increment COMMENT '客户自增id',
`name` varchar(16) NOT NULL COMMENT '客户名称',
`email` varchar(60) default NULL COMMENT '电子邮箱',
`qq` varchar(11) default NULL COMMENT 'QQ号码',
PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;
SET character_set_client = @saved_cs_client;
--
-- Dumping data for table `guest`
--
LOCK TABLES `guest` WRITE;
/*!40000 ALTER TABLE `guest` DISABLE KEYS */;
INSERT INTO `guest` VALUES (1,'test_01','test_01@gmail.com','112345678'),(2,'test_02','test_02@sina.com','23658954'),(3,'test_03','test_03@sina.com','54545454'),(6,'student_01','student_01@guet.edu.cn','245457875'),(5,'四川大学','sichuan@scut.edu.cn','12227445');
/*!40000 ALTER TABLE `guest` ENABLE KEYS */;
UNLOCK TABLES;
--
-- Table structure for table `post`
--
DROP TABLE IF EXISTS `post`;
SET @saved_cs_client = @@character_set_client;
SET character_set_client = utf8;
CREATE TABLE `post` (
`id` int(11) NOT NULL auto_increment COMMENT 'POST主键自增id',
`guest_id` varchar(11) NOT NULL COMMENT '发布人ID',
`post` text NOT NULL COMMENT '发布内容',
`post_time` varchar(14) NOT NULL COMMENT '发布时间',
PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;
SET character_set_client = @saved_cs_client;
--
-- Dumping data for table `post`
--
LOCK TABLES `post` WRITE;
/*!40000 ALTER TABLE `post` DISABLE KEYS */;
INSERT INTO `post` VALUES (1,'1','test_01test_01test_01test_01\r\ntest_01test_01test_01','1310744360'),(2,'2','您好！请问贵校今年的招生人数是多少？','1310744438'),(3,'3','请问，你们公司为实习生提供住宿吗？','1310744711'),(6,'6','请问，我们需要自己带电脑过去吗？','1310973804'),(5,'5','请问你们招收计算机专业的研究生吗？','1310744925');
/*!40000 ALTER TABLE `post` ENABLE KEYS */;
UNLOCK TABLES;
--
-- Table structure for table `revert`
--
DROP TABLE IF EXISTS `revert`;
SET @saved_cs_client = @@character_set_client;
SET character_set_client = utf8;
CREATE TABLE `revert` (
`id` int(11) NOT NULL auto_increment COMMENT 'revert主键自增id',
`post_id` varchar(11) NOT NULL COMMENT '留言ID',
`revert` text NOT NULL COMMENT '回复内容',
`revert_time` varchar(14) NOT NULL COMMENT '回复时间',
`admin` varchar(16) NOT NULL COMMENT '管理员名称',
PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=12 DEFAULT CHARSET=utf8;
SET character_set_client = @saved_cs_client;
--
-- Dumping data for table `revert`
--
LOCK TABLES `revert` WRITE;
/*!40000 ALTER TABLE `revert` DISABLE KEYS */;
INSERT INTO `revert` VALUES (1,'5 ','欢迎报考耶鲁大学计算机专业的研究生！','1310745105','zollty'),(11,'6 ','公司有电脑，但是宿舍没有哦！','1310973862','zollty'),(3,'3 ','提供住宿，实习生是每个月3500的工资！','1310745228','tester'),(4,'5 ','多条回复查询！','1310953006','zollty'),(5,'5 ','再次回复！！！！！！！！','1310959821','zollty'),(6,'2 ','test,sdgdskkjfdsgjkfjk,fdjfd,dfjkj.','1310972183','zollty'),(7,'2 ','什么情况？？\r\ntest!','1310972216','zollty'),(10,'6 ','嗯','1310973819','tester'),(9,'5 ','换个号回复！','1310973648','tester');
/*!40000 ALTER TABLE `revert` ENABLE KEYS */;
UNLOCK TABLES;
/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;
/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
-- Dump completed on 2011-07-18 8:00:13
也可以自行创建该数据库，MySQL下创建数据库的命令如下：
创建数据库：
create database guestbook default character set utf8 collate utf8_general_ci;
创建表：
guest——存储用户信息
post——存储留言
revert——存储回复信息
admin——管理员账号数据库
------------------------------------------------------
create table guest(
id int(11) not null auto_increment comment'客户自增id',
name varchar(16) not null comment'客户名称',
email varchar(60) null comment'电子邮箱',
qq varchar(11) null comment'QQ号码',
primary key(id)
)engine=Myisam;
-------------------------------------------------------
----------------------------------------------------
create table post(
id int(11) not null auto_increment comment'POST主键自增id',
guest_id varchar(11) not null comment'发布人ID',
post text not null comment'发布内容',
post_time varchar(14) not null comment'发布时间',
primary key(id)
)engine=Myisam;
------------------------------------------------------
---------------------------------------------------------
create table revert(
id int(11) not null auto_increment comment'revert主键自增id',
post_id varchar(11) not null comment'留言ID',
revert text not null comment'回复内容',
revert_time varchar(14) not null comment'回复时间',
admin varchar(16) null comment'管理名称',
primary key(id)
)engine=Myisam;
----------------------------------------------------------
-------------------------------------------------------
create table admin(
name varchar(16) not null comment'管理名称',
pwd varchar(16) not null comment'管理员密码',
primary key(name)
)engine=Myisam;
-------------------------------------------------------
外键关系是：guest.id = post.guest_id，post.id = revert.post_id，revert.admin=admin.name
文件清单：
index.php
login.php
logout.php
register.php
register_ok.php
chkadmin.php
post.php
revert.php
delete.php
conn.php
yzm.php
数据库连接文件conn.php如下：
<?php
$conn=mysql_connect('localhost','root','root') or die("connection error".mysql_error());
mysql_select_db("guestbook",$conn);
mysql_query("set names gb2312");
?>
注册页面文件register.php如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>管理员注册</title>
</head>
<script language="javascript">
function rechk()
{
if(register.name.value=="")
{
alert("用户名不能为空！");
register.name.focus();
return false;
}
if(register.pwd.value=="")
{
alert("用户密码不能为空！");
register.pwd.focus();
return false;
}
}
function chkname(form)//利用Js的innerHTML方法实现无刷新验证，下同
{
if(form.name.value=="")
{
name1.innerHTML="<font color=#FF0000>请输入用户名！</font>";
}
else if(form.name.value.length>10)
{
name1.innerHTML="<font color=#FF0000>用户名长度应小于10位！</font>";
}
else
{
name1.innerHTML="<font color=green>恭喜你，该用户名未被占用！</font>";
}
}
function chkpwd1(form)
{
if(form.pwd.value=="")
{
pwd11.innerHTML="<font color=#FF0000>密码格式错误！</font>";
}
else if(form.pwd.value.length<6)
{
pwd11.innerHTML="<font color=#FF0000>注册密码长度应大于6位！</font>";
}
else
{
pwd11.innerHTML="<font color=green>输入正确</font>";
}
}
function chkpwd2(form)
{
if(form.pwd2.value=="")
{
pwd21.innerHTML="<font color=#FF0000>请输入确认密码！</font>";
}
else if(form.pwd2.value.length<6)
{
pwd21.innerHTML="<font color=#FF0000>确认密码长度应大于6位！</font>";
}
else if(form.pwd.value!=form.pwd2.value)
{
pwd21.innerHTML="<font color=#FF0000>注册密码与确认密码不同！</font>";
}
else
{
pwd21.innerHTML="<font color=green>输入正确</font>";
}
}
function chkyzm(form)
{
if(form.yzm.value=="")
{
yzm1.innerHTML="<font color=#FF0000>请输入效验码！</font>";
}
else if(form.yzm.value!=form.yzm2.value)
{
yzm1.innerHTML="<font color=#FF0000>效验码输入错误!</font>";
}
else
{
yzm1.innerHTML="<font color=green>输入正确</font>";
}
}
function yzm(form)//利用yzm生成验证码图像
{
var num1=Math.round(Math.random()*10000000);
var num=num1.toString().substr(0,4);
document.write("<img name=codeimg src='yzm.php?num="+num+"'>");
form.yzm2.value=num;
}
function code(form)
{
var num1=Math.round(Math.random()*10000000);
var num=num1.toString().substr(0,4);
document.codeimg.src="yzm.php?num="+num;
form.yzm2.value=num;
}
</script>
</head>
<body>
<table width="450" border="0" align="center" cellpadding="0" cellspacing="0">
<form id="register" name="register" method="post" action="register_ok.php">
<tr>
<td colspan="5" align="center" valign="middle"><h2>管理员注册</h2></td>
</tr>
<tr>
<td width="81" height="25"><div align="right">用户名：</div></td>
<td height="25" colspan="3">
<input id="name" name="name" type="text" onBlur="javascript:chkname(register)" onMouseOver="this.style.backgroundColor='#ffffff'" onMouseOut="this.style.backgroundColor='#e8f4ff'" /> <font color="red">*</font></td><!--单元格随鼠标变色-->
<td height="25"><div id="name1"><font color="#999999">请输入用户名</font></div></td>
</tr>
<tr>
<td width="81" height="25"><div align="right">注册密码：</div></td>
<td height="25" colspan="3">
<input id="pwd" name="pwd" type="password" onBlur="javascript:chkpwd1(register)" onMouseOver="this.style.backgroundColor='#ffffff'" onMouseOut="this.style.backgroundColor='#e8f4ff'"/> <font color="red">*</font></td>
<td width="152"><div id="pwd11"><font color="#999999">请输入密码</font></div></td>
</tr>
<tr>
<td width="81" height="25"><div align="right">确认密码：</div></td>
<td height="25" colspan="3">
<input id="pwd2" name="pwd2" type="password" onBlur=" javascript:chkpwd2(register)" onMouseOver="this.style.backgroundColor='#ffffff'" onMouseOut="this.style.backgroundColor='#e8f4ff'"/> <font color="red">*</font></td>
<td height="25"><div id="pwd21"><font color="#999999">确认密码</font></div></td>
</tr>
<tr>
<td height="25"><div align="right">验证码：</div></td>
<td height="25">
<input id="yzm" type="text" name="yzm" size="8" onBlur="javascript:chkyzm(register)" onMouseOver="this.style.backgroundColor='#ffffff'" onMouseOut="this.style.backgroundColor='#e8f4ff'"/>
<input name="yzm2" type="hidden" value="" /></td>
<td width="65" align="center" valign="middle"><script>yzm(register)</script></td>
<td width="51"><a href="javascript:code(register)">看不清</a></td>
<td height="25"><div id="yzm1"><font color="#999999">输入验证码</font></div></td>
</tr>
<tr>
<td height="25" colspan="2">
<input type="submit" name="Submit" value="提交" onclick="return rechk();"/>
<input type="reset" value="重写" /></td>
<td height="25" colspan="3"><div style="color:#FF0000">带"*"号的为必填项</div></td>
</tr>
</form>
</table>
</body>
</html>
管理员登录文件login.php如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>管理员登录</title> </head> <body> <table width="590"> <tr> <td width="582"> <form action="chkadmin.php" method="POST" name="myform"> 管理员：<input type="text" name="username" size="20"/> 密码：<input type="password" name="password" size="20"> <input type="submit" value="登录" name="Submit"/> <input type="button" onclick="javascript:location.href='index.php'" value="放弃"/> <a style="color:blue" href="register.php"> 注册</a> </form> </td> </tr> </table> </body> </html>
管理员回复文件revert.php如下：
<?php
session_start();
$con=mysql_connect('localhost','root','root') or die('链接数据库失败！');
mysql_query('set names gb2312');
mysql_select_db('GuestBook');
if(!{1}
SESSION['login']){echo "<script>alert('没有登录不能回复!');location.href='index.php';</script>";exit();}if(
{1}
POST['Submit']){if(!get_magic_quotes_gpc()){//判断PHP解析器是否为数据加上了自动转义，如果没有，就执行foreach语句自己添加转义foreach (
{1}
POST as $items){$items = addslashes($items);}}if(strlen(
{1}
POST['revert'])>400){echo "<script>alert('回复内容过长!');history.go(-1);</script>";exit();}$post_id =
{1}
POST['post_id'];$revert =
{1}
POST['revert'];$time = time();//获取当前时间$insertRevertSql = "insert into revert (post_id,revert,revert_time,admin) value('$post_id','$revert','$time','
{1}
SESSION[admin_name]')";//将当前的回复信息存入数据库if(mysql_query($insertRevertSql)){echo "<script>alert('回复成功\'$time\'');location.href='index.php';</script>";exit();}else{echo "<script>alert('回复失败!');history.go(-1);</script>";}}?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML
1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>无标题文档</title></head><body><table><tr><td><form action="revert.php"
method="POST" name="form1">回复内容：<textarea name="revert" cols="30" rows="5" id="revert"></textarea><input type="hidden" name="post_id" value="<?php echo
{1}
GET['id']?> "size="20"><input type="submit" value="回 复" name="Submit"/><input type="button" onclick="javascript:history.go(-1);" value="放弃"/></form></td></tr></table></body></html>
登出文件logout.php如下：
<?php
session_start();
{1}
SESSION['login']=false;//置为false，取消管理员权限echo "<script language='javascript'>location.href='index.php';</script>";?>
发送留言文件post.php如下：
<?php
header('content-type:text/html;charset=utf-8');//告诉程序我们的脚本将返回什么格式的数据，和返回数据的字符集,否则IE里面看到返回是乱码
if(!get_magic_quotes_gpc())
{//判断PHP解析器是否为数据加上了自动转义，如果没有，就执行foreach语句自己添加转义
foreach ({1}
POST as &$items){$items = addslashes($items);}}$name =
{1}
POST['name'];$qq =
{1}
POST['qq'];$email =
{1}
POST['email'];$post =
{1}
POST['post'];if($name==""||strlen($name)>10){//通过界定符“<<<”在PHP代码中嵌入Js代码和其他代码echo <<<tem<script language="javascript">alert('请输入正确的有户名');history.go(-1);</script>tem;exit();}if($qq==""&&$email==""){echo <<<tem<script>alert('Email和QQ必须输入一个！');history.go(-1);</script>tem;exit();}if($qq!=""&&(!is_numeric($qq)||$qq>9999999999||$qq<=9999)){echo
<<<tem<script>alert("请输入正确的QQ号码");history.go(-1);</script>tem;exit();}if($email!=""&&(!ereg("^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(\.[a-zA-Z0-9_-])+",$email)||strlen($email)>60)){echo <<<tem<script>alert("请输入正确的Email");history.go(-1);</script>tem;exit();}if(strlen($post)>400){echo
<<<tem<script>alert("输入的留言内容太长！");history.go(-1);</script>tem;exit();}//链接数据库$con=mysql_connect('localhost','root','root') or die('链接数据库失败！'.mysql_error());mysql_query('set names gb2312');mysql_select_db('GuestBook');//把客户信息插入guest表$insertSql="insert into
guest (name,qq,email) values ('$name','$qq','$email')";if(mysql_query($insertSql)){$guestid = mysql_insert_id();}else{echo $insertSql;echo mysql_error();echo "数据插入失败!";exit();}//把以上插入取得的客户id和留言信息插入到post表中$post_time = time();$insertPostSql = "insert into post(guest_id,post,post_time)
values('$guestid','$post','$post_time')";if(mysql_query($insertPostSql)){echo <<<tem<script>alert("留言成功");location.href="index.php";</script>tem;}else{echo <<<tem<script>alert("留言失败");location.href="index.php";</script>tem;}?>
注册验证文件register_ok.php如下：
<?php
session_start();
class chkinput{
var $name;
var $pwd;
function chkinput($x,$y)
{
$this->name=$x;//实例化类
$this->pwd=$y;
}
function checkinput()
{
include "conn.php";//引进数据库连接文件
$return=mysql_query("insert into admin(name,pwd) values('".$this->name."','".$this->pwd."')");//将注册的账号和密码插入数据库
if($return)
{
{1}
SESSION['login']=true;//注册成功后，赋予管理员权限
{1}
SESSION[admin_name]=
{1}
POST[name];//记录登录的管理员的nameecho "<script language='javascript'>alert('恭喜你，注册成功！');location.href='index.php';</script>";}else{echo "<script language='javascript'>alert('管理员注册失败！');history.back();</script>";exit();}}}$obj=new chkinput(trim(
{1}
POST[name]),trim(md5(
{1}
POST[pwd])));//注册的密码通过MD5加密后在存入数据库$obj->checkinput();?>
管理员登录验证文件chkadmin.php如下：
<?php
session_start();
class chkinput
{
var $name;
var $pwd;
function chkinput($x,$y)
{
$this->name=$x;
$this->pwd=$y;
}
function checkinput()
{
include "conn.php";
$sql=mysql_query("select * from admin where name='".$this->name."'");//即执行select * from admin where name='传入的数据'
$info=mysql_fetch_array($sql);
if($info==fasle)
{
echo "<script language='javascript'>alert('不存在此管理员！');history.back();</script>";
exit();
}
else
{
if($info[pwd]==$this->pwd)
{
{1}
SESSION['login']=true;
{1}
SESSION[admin_name]=$info[name];echo "<script language='javascript'>alert('恭喜你，登录成功！');location.href='index.php';</script>";}else{echo "<script language='javascript'>alert('密码错误！');history.back();</script>";exit();}}}}$obj=new chkinput(trim(
{1}
POST['username']),trim(md5(
{1}
POST['password'])));$obj->checkinput();?>
生成随机文件yzm.php如下：
<?php
//此为生成随即验证码的文件，主要使用的是srand()和imagestring()函数
srand((double)microtime()*1000000);
$im=imagecreate(42,16);
$black=imagecolorallocate($im,0,0,0);
$white=imagecolorallocate($im,255,255,255);
$gray=imagecolorallocate($im,200,200,200);
imagefill($im,0,0,$gray);
for($i=0;$i<4;$i++){
$str=mt_rand(1,3);
$size=mt_rand(3,6);
$authnum=substr({1}
GET[num],$i,1); imagestring($im,$size,(2+$i*10),$str,$authnum,imagecolorallocate($im,rand(0,130),rand(0,130),rand(0,130)));} for($i=0;$i<200;$i++){ $randcolor=imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255)); imagesetpixel($im,rand()%70,rand()%30,$randcolor);
}imagepng($im);imagedestroy($im);?>
删除留言页面文件delete.php如下：
<?php
session_start();
header('content-type:text/html;charset=utf-8');
$con=mysql_connect('localhost','root','root') or die('链接数据库失败！');
mysql_query('set names gb2312');
mysql_select_db('GuestBook');
if(!{1}
SESSION['login'])//若管理员未登录，则拒绝，退出该文件{echo "<script>alert('权限不足！');window.location.href='index.php';</script>";exit();}if(isset(
{1}
GET['id'])&&
{1}
GET['id']!="")//如果post.id存在且不为空，则可执行删除操作{$delRevertSql="delete from revert where post_id=".
{1}
GET['id'];mysql_query($delRevertSql);$delGuestSql="delete from guest where id = (select guest_id from post where id=".
{1}
GET['id'].")";mysql_query($delGuestSql);$delPostSql="delete from post where id=".
{1}
GET['id'];mysql_query($delPostSql);if(mysql_error()==""){echo "<script>alert('删除成功！');window.location.href='index.php';</script>";}}?>
首页文件index.php如下：
<?php
session_start();
$con=mysql_connect('localhost','root','root') or die('链接数据库失败！');
mysql_query('set names gb2312');
mysql_select_db('GuestBook');
$pagesize = 8;//每一页显示多少留言记录
if(isset({1}
GET['page'])&&
{1}
GET['page']!='') $page=
{1}
GET['page'];else $page=0;$sql = "SELECT a . * , b.name, b.email, b.qq, c.revert_time, c.post_id, c.revert,c.adminFROM post aLEFT JOIN revert c ON ( a.id = c.post_id ) , guest bWHERE a.guest_id = b.idORDER BY a.id DESC";$numRecord = mysql_num_rows(mysql_query($sql));//获取总记录条数$totalpage
= ceil($numRecord/$pagesize);//进1法取整$recordSql = $sql. " LIMIT ".$page*$pagesize.",".$pagesize;//附上限制条件$result = mysql_query($recordSql);?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html
xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>简易留言板PHP</title><style type="text/css">body {margin-left: 0px;margin-top: 0px;}a:link {text-decoration: none;color: #FF6600;}.STYLE1 {color:
#FFFFFF;font-weight: bold;font-size: 20px;}</style><script language="javascript">function checkInput(){//Js正则表达式验证var Email = document.getElementById('email');//通过id获取文本框中输入的内容var QQ = document.getElementById('qq');var name = document.getElementById('name');var
post = document.getElementById('post');//验证用户名：不能超过10个字符（5个汉字），不能输入非法字符，不能为空nameValue = name.value.replace(/\s+/g,"");//replace()方法用于替换一个与正则表达式匹配的子串,/\s+/后跟g代表全局替换var SPECIAL_STR = "~!%^&*();\"?><[]{}\\|,:/=+—";var nameflag=true;for(i=0;i<nameValue.lenght;i++){if
(SPECIAL_STR.indexOf(nameValue.charAt(i)) !=-1)//charAt()方法可返回指定位置的字符nameflag=false;//indexOf()方法可返回某个指定的字符串值在字符串中首次出现的位置}if(nameValue==''){alert('请填写用户名称！');return false;}if(nameValue.length>10){alert('用户名称最多10个字符（5个汉字）！');return false;}if(nameflag===false){alert('用户名称不能包含非法字符请更改！');return
false;}//验证QQ号码var par =/^[1-9]\d{4,12}$/;if(QQ.value!=''&&!par.test(QQ.value)){alert('请输入正确的QQ号码');return false;}//验证Email地址var emailpar = /^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/;if(Email.value!=''&&!emailpar.test(Email.value)){alert('请输入正确的邮箱地址！');return
false;}if(QQ.value==''&&Email.value==''){alert('邮箱和QQ必选其一');return false;}if(post.value==""){alert('请输入留言内容！');return false;}if(post.value.length>400){alert('留言内容太长！');return false;}}</script></head><table width="800" border="0" align="center"> <tr> <td height="80"
bgcolor="#003366"><span class="STYLE1"> 简易留言板PHP（<a href="http://blog.csdn.net/zollty" class="STYLE1">zollty</a>）</span></td> </tr> <tr> <td height="5" bgcolor="#efefef"></td> </tr></table><table width="800" border="0" align="center" bgcolor="#fefefe"><?php$reply_id=0;//记录留言idwhile($rs=mysql_fetch_object($result))//把返回对象赋值给rs变量{if($rs->id
!= $reply_id)//若留言id不等于当前回复的id则显示回复信息，否则隐藏留言，直接显示后面的回复{?> <tr><hr/></tr><tr> <div style="color:blue">留言人：<?php echo $rs->name?> | Email：<?php echo $rs->email?> | QQ:<?php echo $rs->qq?> | 留言时间：<?php echo date("Y-m-d H:i:s",$rs->post_time+8*3600)?></div></tr>
<?php if(isset(
{1}
SESSION['login'])&&
{1}
SESSION['login'])//如果管理员已经登录，则显示回复和删除的权限 { ?> <tr> <a href="revert.php?id=<?php echo $rs->id?>">回复</a> | <a href="delete.php?id=<?php echo $rs->id?>">删除</a> </tr> <?php }//end if(isset…) ?> <?php echo nl2br(htmlspecialchars($rs->post))."<br/>"; }//end if($rs->id…)
?> <?phpif($rs->revert!=""){?> <br/><font style="color:red">管理员[<?php if($rs->admin != "") echo $rs->admin;?>]回复：</font><?php echo nl2br(htmlspecialchars($rs->revert));?>[回复时间：<?php if($rs->revert_time!="") echo date("Y-m-d H:i:s",$rs->revert_time+8*3600);?>]<?php
}//end if($rs->revert!="")?><?php$reply_id=$rs->id;//把post.id赋值给$reply_id以便下一轮检测post.id是否与上一轮相同}//end while()?></table><table width="800" border="0" align="center" bgcolor="#B1C3D9"> <tr> <td ><?php if($page>0) echo "<a href='index.php?page=".($page-1)."'>上一页|</a>"
;if($page<$totalpage-1) echo "<a href='index.php?page=".($page+1)."'>下一页</a>" ;//点击下一页后page变量加1，将显示"上一页"?></td> </tr></table><form action="post.php" method="post" id="postForm" name="postForm"><table width="800" border="0" align="center" cellspacing="1" bgcolor="#efefef">
<tr> <td width="117" bgcolor="#FFFFFF">姓名：</td> <td width="673" bgcolor="#FFFFFF"><label> <input type="text" name="name" id="name" /> </label></td> </tr> <tr> <td bgcolor="#FFFFFF">Email：</td> <td bgcolor="#FFFFFF"><label> <input type="text" name="email" id="email"
/> </label></td> </tr> <tr> <td bgcolor="#FFFFFF">QQ：</td> <td bgcolor="#FFFFFF"><label> <input type="text" name="qq" id="qq"/> </label></td> </tr> <tr> <td colspan="2" bgcolor="#FFFFFF">留言内容：</td> </tr> <tr> <td colspan="2" bgcolor="#FFFFFF"><label> <textarea
name="post" id="post" cols="40" rows="5"></textarea> </label></td> </tr> <tr> <td colspan="2" bgcolor="#FFFFFF"><label> <input type="submit" name="Submit" value="提交" onclick="return checkInput();"/> <input type="reset" name="Submit2" value="重置" />
</label> <a href="login.php">管理员登录</a> <?php if(isset(
{1}
SESSION['login'])&&
{1}
SESSION['login']) { ?> <a href="logout.php">退出</a></td> <?php }//end if ?> </tr></table></form></body></html>
乱码（部分换行符没了，部分代码丢失（换成了“{1}”），某些一段代码变成了几段），编辑器的问题，再次强调：是文本编辑器的问题，我的代码是纯txt格式，操作也无错，我试过了几次。
找到乱码的原因了：http://blog.csdn.net/zollty/article/details/7163049。