<?php
  /**************************************/
  /*  文件名：clearmsg.php  */
  /*  功能：清空聊天记录页面  */
  /**************************************/

include "config.inc.php";  //包含配置信息
  include "header.inc.php"; //包含公用头部页面

//用户名
  $username = $_SESSION['username'];
  //行为
  $action = $_GET['action'];

if($action == "private")
  {
 //删除用户的私有聊天记录

//将发送者为$username的记录设置删除标记
 $query = "UPDATE chatter_privboard SET delfrom = 1
    WHERE fromname = '$username'";
 $result = @mysql_query ($query);

//将接受者为$username的记录设置删除标记
 $query = "UPDATE chatter_privboard SET delto = 1
    WHERE toname = '$username'";
 $result = @mysql_query ($query);

ExitMessage("全部私聊信息清除成功！", "action.php");
  }
  elseif($action == "all")
  {
 //查询管理员
 $query = "SELECT * FROM chatter_users
    WHERE username = '$username' AND isadmin = 1";
 $result = mysql_query ($query);

//判断是否为管理员
 $num_rows = mysql_num_rows($result);
 $isadmin = ($num_rows > 0) ? true : false;

if($isadmin)
 {
  //清空公共聊天记录
  $query = "TRUNCATE TABLE chatter_chatboard";
  $result = @mysql_query ($query);

//清空私有聊天记录
  $query = "TRUNCATE TABLE chatter_privboard";
  $result = @mysql_query ($query);

ExitMessage("全部信息清除成功！", "action.php");
 }
 else
 {
  ExitMessage("只有管理员可以清除全部聊天记录！", "");
 }
  }
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?>