本文实例为大家分享了php留言板功能的具体代码，供大家参考，具体内容如下
数据库用到的三张表
一.登录界面 （denglu.php login.php）
1.denglu.php
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<h1>开发部内部留言板</h1>
<form action="login.php" method="post">
<div>用户名：<input type="text" name="username" /></div>
<div>口令：<input type="password" name="password" /></div>
<input type="submit" value="登录" />
<a href="denglu.php" style="text-decoration:none"><input type="button" value="复位" /></a>
</form>
</body>
</html>
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2.login.php
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<?php
session_start();
$username = $_post["username"];
$password = $_post["password"];
require "dbda.class1.php";
$db = new dbda();
$sql = "select password from yuangong where username = '{$username}'";
$arr = $db->query($sql);
if(count($arr))
{
if($arr[0][0] == $password && !empty($password))
{
//存储用户名
$_session["username"] = $username;
header("location:main.php");
}
}
else
{
header("location:denglu.php");
}
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二.主界面（main.php tuichu.php）
1.main.php
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<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<?php
session_start();
// 防止绕过登陆直接进入主界面
if(empty($_session["username"]))
{
header("location:denglu.php");
exit;
}
require "dbda.class1.php";
$db = new dbda();
$username = $_session["username"];
?>
<div>
<a href="fabu.php">发布信息</a>
<a href="tuichu.php">退出系统</a>
</div><br /><br />
<h1>留言信息：</h1>
<table width="100%" border="1" >
<tr>
<td>发送人</td>
<td>发送时间</td>
<td>接收人</td>
<td>信息内容</td>
</tr>
<?php
//显示接收者是我的，或者是所有人的
$sql = "select * from liuyan where recever='{$username}' or recever='suoyou'";
$arr = $db->query($sql);
foreach($arr as $v)
{
echo "<tr>
<td>{$v[1]}</td>
<td>{$v[3]}</td>
<td>{$v[2]}</td>
<td>{$v[4]}</td>
</tr>";
}
?>
</table>
</body>
</html>
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2.tuichu.php
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<?php
session_start();
unset($_session["username"]);
header("location:denglu.php");
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三.发送页面（fabu.php fabuchuli.php）
1.fabu.php
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<!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=utf-8" />
<title>无标题文档</title>
</head>
<body>
<div>
<a href="main.php">查看信息</a>
<a href="tuichu.php">退出系统</a>
</div>
<h1>信息发送：</h1>
<form action="fabuchuli.php" method="post">
<div>接收人：
<select name="jsr">
<option value="suoyou">所有人</option>
<?php
session_start();
$username = $_session["username"];
require"dbda.class1.php";
$db = new dbda();
//方法一
$sql = "select friend.friend,yuangong.name from friend,yuangong where friend.friend = yuangong.username and friend.me = '{$username}'";
$arr = $db->query($sql);
foreach($arr as $v)
{
echo "<option value='{$v[0]}'>{$v[1]}</option>";
}
//方法二
/*$sql = "select friend from friend where me ='{$username}'";
$arr = $db->query($sql);
foreach($arr as $v)
{
$v[0];
$sname = "select name from yuangong where username = '{$v[0]}'";
$aname = $db->query($sname);
echo"<option value='{$v[0]}'>{$aname[0][0]}</option>";
}*/
?>
</select></div>
<div>信息内容：<textarea name="neirong"></textarea></div>
<input type="submit" value="发送" />
<a href="fabu.php" style="text-decoration:none"><input type="button" value="复位" /></a>
</form>
</body>
</html>
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2.fabuchuli.php
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<?php
session_start();
$username = $_session["username"];
$jsr = $_post["jsr"];
$nr = $_post["neirong"];
$times = date("y-m-d h:i:s");
require"dbda.class.php";
$db = new dbda();
$sql = "insert into liuyan values('','{$username}','{$jsr}','{$times}','{$nr}')";
$db->query($sql,0);
header("location:fabu.php");
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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。