php实现留言板功能（会话控制）

2019-11-21 21:03:51

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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

<!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>

2.login.php

<?phpsession_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");}

二.主界面（main.php tuichu.php）

1.main.php

<!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><?phpsession_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>

2.tuichu.php

<?phpsession_start();unset($_SESSION["UserName"]);header("location:denglu.php");

三.发送页面（fabu.php fabuchuli.php）

1.fabu.php

<!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>

2.fabuchuli.php

<?phpsession_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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