PHP实现留言板功能：
1 首先是登录页面：
<!DOCTYPE html><html> <head> <meta charset="UTF-8"> <title>留言板登录</title> <script src="bootstrap/js/jquery-1.11.2.min.js"></script> <script src="bootstrap/js/bootstrap.min.js"></script> <link href="bootstrap/css/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="stylesheet" type="text/css"/> </head> <style> .header{ margin-left: 550px; margin-top: 150px; height: 300px; max-width: 300px; } .xiugai{ max-width: 200px; } .login{ margin-top: 10px; } </style> <body> <form action="messloginchuli.php" method="post"> <div class="header"> <h2>开发部内部留言板</h2> <div class="input-group xiugai"> <span class="input-group-addon" >用户名:</span> <input type="text" class="form-control" name="uid" placeholder="请输入用户名"> </div> <div class="input-group xiugai" > <span class="input-group-addon">口令：</span> <input type="text" class="form-control" name="pwd" placeholder="请输入口令"> </div> <button type="submit" class="btn btn-success login">登录</button> </div> </form> </body></html>2 登录页面完成后要进入登录处理页面了，也就是上面提交到的messloginchuli.php
<?phpsession_start(); // 登录之后要把所包含登录的页面连接起来，开启session$uid = $_POST["uid"];$pwd = $_POST["pwd"];require_once "./DBDA.class.php";$db = new DBDA();$sql = "select password from yuangong where username="{$uid}"";$arr = $db->query($sql,0);//var_dump($arr[0][0]);if($arr[0][0]=$pwd && !empty($pwd)){ $_SESSION["uid"]=$uid; header("location:message.php");}?>登录页面效果如图：
3.登录完成后是进入主页面，也就是显示自己收到的对话内容，下面是设计的数据库的表格和主页面的代码：
<!DOCTYPE html><html> <head> <meta charset="UTF-8"> <title></title> <script src="bootstrap/js/jquery-1.11.2.min.js"></script> <script src="bootstrap/js/bootstrap.min.js"></script> <link href="bootstrap/css/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="stylesheet" type="text/css"/> </head> <style> .mess{ max-width: 800px; margin-left: 250px; margin-top: 150px; } </style> <body> <?php session_start(); $uid = $_SESSION["uid"]; if(empty($_SESSION["uid"])){ header("location:messlogin.php"); exit; } ?> <div > <a href="publish_info.php" rel="external nofollow" >发布信息</a> <a href="tuichuchuli.php" rel="external nofollow" >退出系统</a> </div> <table class="table table-bordered mess" > <caption > 留言信息： </caption> <thead> <tr> <th>发送人</th> <th>发送时间</th> <th>接收人</th> <th>信息内容</th> </tr> </thead> <tbody> <?php require_once "./DBDA.class.php"; $db = new DBDA(); $sql = "select * from liuyan where recever="{$uid}" or recever="all""; $arr = $db->query($sql,0); foreach($arr as $v){ echo "<tr> <td>{$v[1]}</td> <td>{$v[2]}</td> <td>{$v[3]}</td> <td>{$v[4]}</td> </tr>"; } ?> </tbody> </table> </body></html>退出登录系统实现用户注销，返回登录页面功能代码如下：
<?phpsession_start();$uid = $_SESSION["uid"];unset($uid);header("location:messlogin.php");？>代码写到这里，比较重要的部分就完成了，下面是要进入发布信息页面了，相当于之前写的添加的页面，其处理页面也是和之前没什么区别的，差别在于现在的处理页面是在用户登录的情况下操作的，需要用session把所有的登录情况下的页面连接起来
主页面效果如图：
4.最后是信息发布页面，可以给任何人发送信息
代码如下：
<!DOCTYPE html><html> <head> <meta charset="UTF-8"> <title>发布信息界面</title> <script src="bootstrap/js/jquery-1.11.2.min.js"></script> <script src="bootstrap/js/bootstrap.min.js"></script> <link href="bootstrap/css/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="stylesheet" type="text/css"/> </head> <style> .mess{ max-width: 200px; margin-top: 10px; } .mess1{ margin-top: 10px; } .opt{ max-width: 200px; margin-left: 80px; } .txt{ max-width: 200px; } </style> <body><?phpsession_start();$uid = $_SESSION["uid"];if (empty($_SESSION["uid"])) { header("location:messlogin.php"); exit ;}?> <div > <div > <a href="message.php" rel="external nofollow" >查看信息</a> <a href="seemess.php" rel="external nofollow" >查看发送信息</a> </div> <form class="form-horizontal" role="form" action="infochuli.php" method="post"> <div class="form-group"> <label for="firstname" class="col-sm-2 control-label mess1">接收人:</label> <div class="form-group "> <select class="form-control opt" name="recever"> <option value="all">所有人</option> <?php require_once "./DBDA.class.php"; $db = new DBDA(); //这里可以给特定的朋友发送信息的sql语句 //$sql = "select firend.firend,yuangong.name from firend,yuangong where firend.firend //= yuangong.username and firend.me = "{$uid}""; $sname = "select * from yuangong where username not in ("{$uid}")"; $arr = $db->query($sname,0); //var_dump($arr[0][2]); foreach($arr as $v){ echo "<option value="{$v[0]}">{$v[2]}</option>"; } ?> </select> </div> </div> <div class="form-group"> <label for="lastname" class="col-sm-2 control-label mess1">信息内容:</label> <div class="col-sm-10"> <textarea class="form-control txt" rows="3" name="content"></textarea> </div> </div> <div class="form-group"> <div class="col-sm-offset-2 col-sm-10"> <button type="submit" class="btn btn-default"> 发送 </button> </div> </div> </form> </div> </body></html>发信息页面如图：
5.发布信息完成后要进入处理页面了，也就是提交到的infochuli.php，最后返回发送信息界面
<?phpsession_start();$uid = $_SESSION["uid"];$recever = $_POST["recever"];$content = $_POST["content"];$arr = $_POST["recever"];$t = date("Y-m-d H:i:s");require_once "./DBDA.class.php";$db = new DBDA();$sql = "insert into liuyan values("","{$uid}","{$t}","{$recever}","{$content}",0)";$arr = $db->query($sql);if($arr && !empty($arr)){ header("location:publish_info.php");}else{ echo "发送失败!";}?>以上这篇使用PHP连接数据库实现留言板功能的实例讲解(推荐)就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持网页设计。
