1 用戶必須注冊登陸，在數據庫 userinfo 里面保存如下幾個字段
Name 不用問了，這是登陸用的用戶名，必須唯一
Password 登陸密碼
NickName 用戶昵稱，也就是顯示的名字
Face 存放著用戶頭像的編號，比如 01，代表 /images/face/01.gif 頭像文件
OnlineStatus 用戶是否在線的標志，在用戶登陸的時候設置為 1
CurrentDate 用戶最后訪問/更新的時間，用于判斷用戶是否在線
聊天紀錄 forumtalk 的結構為
CREATE TABLE forumtalk (
id int(11) NOT NULL auto_increment,
sender varchar(20) NOT NULL,
receiver varchar(20) NOT NULL,
date int(11) DEFAULT '0' NOT NULL,
readsign tinyint(4) DEFAULT '0' NOT NULL,
body varchar(200) NOT NULL,
PRIMARY KEY (id),
UNIQUE id_2 (id),
KEY id (id)
);
其中 sender 是發送人的 Name
receiver 是接受人的 Name
date 是發言的時間
readsign 發言是否已經閱讀過
body 發言內容
2 顯示在線用戶的頭像
<?
$onlineresult = mysql_query("select Name,NickName,Face,EnterTimes from userinfo where OnlineStatus=1 and CurrentDate >".(date("U")-120));
$onlinenumber = mysql_num_rows($onlineresult);
echo "歡迎光臨，共有:".$onlinenumber."位朋友在線，按頭像發短信息:";
for($i=0;$i<$onlinenumber;$i++)
{
if(!$onlineuser = mysql_fetch_array($onlineresult))break;
echo "<a onClick=MM_openBrWindow('shortalk.php?talkto=".$onlineuser['Name']."','".$onlineuser['Name']."','width=300,height=250')><img src="/Files/BeyondPic/2005-12/19/05121906592254661.gif" width=20 height=20 ";
if($name == $onlineuser['Name'])echo "border=1 ";
echo " title='代號:".$onlineuser['Name']."\n昵稱:".$onlineuser['NickName']."\n來訪:".$onlineuser['EnterTimes']."'></a>";
}
?>
其中的 onClick 用于彈出發送消息的對話窗口，大家可以在網頁的源代碼里面看到
3 在線用戶的信息掃描和更新
在網頁中使用內置框架來調用掃描和更新程序，這行也能在網頁源代碼里面看到！
<iframe name=flush src="userflush.php" width="0" height="0" frameborder="0" scrolling="NO" marginwidth="0" marginheight="0" hspace="0" vspace="0"></iframe>
4 信息掃描和更新程序 userflush.php
<?
session_start();
mysql_connect("localhost","","");
mysql_select_db("php2000");
$delaytime=0;
// 查找新的發言
$query = "select * from forumtalk where readsign=0 and receiver='$name'";
$result = mysql_query($query);
if( mysql_num_rows($result) > 0)
{
// 讀取和顯示彈出窗口
$msg = mysql_fetch_array($result);
$numberfriend = $msg['id'];
echo "<script language=javascript>window.open('shortalk.php?action=view&talknumber=$numberfriend','_blank','width=300,height=250')</script>";
}
// 設置當前用戶的最新時間標志，表示它在線
mysql_query("update userinfo set currentdate=".date("U")." where name='$name'");
// 設置刷新時間間隔為15秒
echo "<meta http-equiv='refresh' content='15;url=userflush.php'>";
?>
5 聊天信息的發送、閱讀和回復程序 - shortalk.php
<?
require("require.php"); // 判斷用戶是否合法在線的公用程序
?>
<html>
<head>
<title>短信息</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<style type="text/css">
td {font-size:9pt}
</style>
<script language="Javascript">
<!--
function docheck() {
if (document.sendmsg.replymessage.value=="") {
alert("缺少內容：需要輸入您的留言內容");
document.sendmsg.replymessage.focus();
return(false);
}
return (true);
}
function MM_openBrWindow(theURL,winName,features) { //v2.0
window.open(theURL,winName,features);
}
//-->
</script>
</head>
<body bgcolor="#DDDDFF"leftmargin="0" topmargin="0" background="phpchat_images/cloudtile.jpg">
<?
if($action == "view")
{
$tmp = mysql_fetch_array(mysql_query("select sender,body,date from forumtalk where id=$talknumber and receiver='$name'"));
$msg = $tmp['body'];
$message = ereg_replace("
","\r\n",$msg);
mysql_query("update forumtalk set readsign=1 where id=$talknumber");
$sendernickname = mysql_fetch_row(mysql_query("select nickname from userinfo where name='".$tmp['sender']."'"));
?>
<table width="300" border="0" cellspacing="0" cellpadding="0" height="200" bgcolor="f0f0f0">
<tr>
<td colspan="2" height="20" bgcolor="99cc99" align="center">查看短信息</td>
</tr>
<tr>
<td colspan="2" height="20"><?echo date("m月d日 h:i",$tmp['date'])." ".$sendernickname[0]?> 給你[<?echo $name?>]留言:</td>
</tr>
<form name=viewtalk action=shortalk.php method=post>
<input type=hidden name=talkto value=<?echo $tmp['sender']?>>
<input type=hidden name=action value=send>
<input type=hidden name=talknumber value=<?print($talknumber)?>>
<tr align="center">
<td colspan="2" height="146" valign="top">
<textarea name="textfield" cols="40" rows="11" readonly><?print($message)?></textarea>
</td>
</tr>
<tr>
<td colspan="2" align="center">
<input type="submit" name="toreply" value="回復留言 Enter">
<a href="#" onClick="MM_openBrWindow('memberviewtalk.php?talkto=<?echo $tmp['sender']?>','viewtalk','scrollbars=yes')">聊天紀錄</a> </td>
</tr>
</form>
</table>
<script language="Javascript">
document.viewtalk.toreply.focus();
</script>
<?
}
else if ($action == "sendbegin")
{
$replymessage = ereg_replace("\r\n","
",$replymessage);
$replymessage = ereg_replace(">",">",$replymessage);
$replymessage = ereg_replace("<","<",$replymessage);
$replymessage = substr($replymessage,0,2000);
mysql_query("insert into forumtalk (sender,receiver,body,date) values ('$name','$talkto','$replymessage',".date("U").")");
print("<script language='javascript'>window.close()</script>");
}
else
{
?>
<table width="300" border="0" cellspacing="0" cellpadding="0" height="200" bgcolor="f0f0f0">
<form name=sendmsg action=shortalk.php method=post OnSubmit=return(docheck());>
<input type=hidden name=action value=sendbegin>
<tr align="center">
<td colspan="2" height="20" bgcolor="99cc99">發送短信息</td>
</tr>
<tr align="center">
<td colspan="2" height="20">發言對象：
<select name="talkto">
<?
$result = mysql_query("select name,nickname from userinfo where onlinestatus=1");
while($msg=mysql_fetch_array($result))
{
if($msg['name']==$talkto)
echo "<option value='".$msg['name']."' selected>".$msg['nickname']."</option>\n";
else
echo "<option value='".$msg['name']."'>".$msg['nickname']."</option>\n";
}
?>
</select>
請短于500字符 </td>
</tr>
<tr align="center">
<td colspan="2" height="146" valign="top">
<textarea name="replymessage" cols="40" rows="9"></textarea>
</td>
</tr>
<tr align="center">
<td colspan="4">
<?
if($talknumber != "")
{
print("<input type=button name=review value='查看前一留言 Alt+P' accesskey='p' onClick='javascript:history.go(-1)'>");
}
?>
<input type="submit" name="reply" value="開始新的發送留言 Alt+S" accesskey='s'>
<a href="#" onClick="MM_openBrWindow('memberviewtalk.php?talkto=<?echo $talkto?>','viewtalk','scrollbars=yes')">聊天紀錄</a></td>
</tr>
</form>
</table>
<script language="Javascript">
document.sendmsg.replymessage.focus();
</script>
<?
}
?>
</body>
</html>
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