PHP程序百行代码快速构建简易聊天室方法_php应用

PHP程序百行代码快速构建简易聊天室方法

基本功能：能登陆，聊天，记录在线人数ip事件，能控制聊天的字体颜色，自动把转化聊天中网址为链接地址，能定制聊天室标题、广告信息等等。使用文本作为存储媒体，又兴趣可以参考代码，并且进行扩展。
其实php作为快速开发的脚本语言是很棒的！
===代码===

 * 创建: 2005-8-10 22:42
 * 修改: 2005-8-11 23:25
 */
error_reporting(7);
session_start();
header("ContentType:text/html;charset=gb2312");
define("SCRIPT", $_SERVER['SCRIPT_NAME']);
define("CHAT_NOTE", "./chat.txt");
define("ONLINE_LIST", "./online.txt");
define("REF_TIME", 5);
define("CHAT_NAME", "黑夜路人聊天室");
define("AD_MSG", "今天是中国情人节, 祝大家情人节快乐!!");

//获取值
if (isset($_GET['action']) && !empty($_GET['action'])) {
 $action = $_GET['action'];
}

//如果已经登陆那么直接跳到聊天界面
if (!isset($_GET['action']) && isset($_SESSION['username'])) {
 header("location:".SCRIPT."?action=chat");
}

//登陆提示
if (!isset($_GET['action'])) 
{
 if (!session_is_registered('username'))
 {
  echo " 
[ ".CHAT_NAME." ] © 2005

   
   

   呢称: 
   
   

   ";
  exit;
 }
}

//校验登陆
if ($action=='login')
{
 if (isset($_POST['login_user']) && !empty($_POST['login_user'])) {
  $username = $_POST['login_user'];
 } else {
  $username = "游客";
 }
 session_register('username');
 save_online($username, get_client_ip());
 header("location:".SCRIPT."?action=chat");
}

//开始聊天www.cncms.com
if ($action=="chat")
{
 $online_sum = get_online_sum();
 echo "[ ".CHAT_NAME." ]

   



    ".AD_MSG." 　 
[当前在线：$online_sum]
   
 ";
}

//说话界面
if ($action=="say")
{
 echo "<head><title>[ ".CHAT_NAME." ]</title></head><center>
<body bgcolor=#C4BFB9 style='font-size:12px;'>
  <form action=".SCRIPT."?action=save method=post name=chat
>
  [".$_SESSION['username']."]说:<input type=text size=80
maxlength=500 name=chatmsg style=' background-color:#99CC99;
width:550px; height:22px; border:1px solid:#000000'>
  <select name=usercolor>
  <OPTION selected style='COLOR: #000000' value='000000'>默认颜色</OPTION>
  <OPTION style='COLOR: #000000' value='#000000'>黑色沉静</OPTION> 
  <option style='COLOR: #ff0000' value='#FF0000'>红色热情</option> 
  <option style='COLOR: #0000ff' value='#0000FF'>蓝色开朗</option> 
  <option style='COLOR: #ff00ff' value='#FF00FF'>桃色浪漫</option> 
  <option style='COLOR: #009900' value='#009900'>绿色青春</option> 
  <option style='COLOR: #009999' value='#009999'>青色清爽</option> 
  <option style='COLOR: #990099' value='#990099'>紫色拘谨</option> 
  <option style='COLOR: #990000' value='#990000'>暗夜兴奋</option> 
  <option style='COLOR: #000099' value='#000099'>深蓝忧郁</option> 
  <option style='COLOR: #999900' value='#999900'>卡其制服</option> 
  <option style='COLOR: #ff9900' value='#FF9900'>镏金岁月</option> 
  <option style='COLOR: #0099ff' value='#0099FF'>湖波荡漾</option> 
  <option style='COLOR: #9900ff' value='#9900FF'>发亮蓝紫</option> 
  <option style='COLOR: #ff0099' value='#FF0099'>爱的暗示</option> 
  <option style='COLOR: #006600' value='#006600'>墨绿深沉</option> 
  <option style='COLOR: #333333' value='#333333'>灰色轨迹</option> 
  <option style='COLOR: #999999' value='#999999'>伦敦灰雾</option> 
  </select>
  <input type=submit value='说话' style='background-color:#ffffff'>
退出
  </form>
  《script》function check(){if(document.chat.chatmsg.value=='')
{;alert('请输入聊天信息!');return false;}return true;}《script》
  ";
}

//保存说话
if ($action=="save")
{
 if ($_POST['chatmsg']!="") {
  save_chat($_POST['chatmsg'], $_SESSION['username'], $_POST['usercolor']);
 }
 header("location:".SCRIPT."?action=say");
}

//显示聊天记录
if ($action=="show")
{
 echo "<body style='font-size:12px' >";
 echo "<META HTTP-EQUIV=REFRESH 
CONTENT='".REF_TIME.";URL=".SCRIPT."?action=show'>";
 if (file_exists(CHAT_NOTE)) {
  $chat_msg = @file_get_contents(CHAT_NOTE);
  echo $chat_msg;
 } else {
  echo "目前没有人说话";
 }
}

//退出聊天室
if ($action=="logoff")
{
 unset($_SESSION['username']);
 session_destroy();
 header("location:".SCRIPT);
}

/* 基本函数 */

//保存聊天记录函数
function save_chat($msg, $user, $color)
{
 if (!$fp = fopen(CHAT_NOTE, "a+")) {
  die('创建聊天记录文件失败, 请检查是否有权限.');
 }
 $msg = htmlspecialchars($msg);
 $msg = PReg_replace('/([http|ftp:\/\/])*([a-zA-])
+\.([a-zA-Z0-9_-])+\.([a-zA-Z0-9_-])+(a-zA-Z0-9_)*/', '
\\0', $msg);
 $msg = preg_replace('/([a-zA-Z0-9_\.])+@([a-zA-Z0-9-])
+\.([a-zA-Z0-9-]{2,4})+/', '\\0', $msg);
 $msg = date('H:i:s')." [".$user."]说: 
<font color='".$color."'>".$msg."</font><br>\r\n";
 if (!fwrite($fp, $msg)) {
  die('写入聊天记录失败.');
 }
 fclose($fp);
}
//写在线人信息
function save_online($user, $ip)
{
 if (!$fp = fopen(ONLINE_LIST, "a+")) {
  die("创建在线列表文件失败, 请检查是否有权限.");
 }
 $user = str_replace("|", "", $user);
 $line = $user."|".$ip."|".time()."\r\n";
 if (!fwrite($fp, $line)) {
  die("写入在线列表失败.");
 }
 fclose($fp);
}
//获取在线人数
function get_online_sum()
{
 if (file_exists(ONLINE_LIST)) {
  $online_msg = file(ONLINE_LIST);
  return count($online_msg);
 } else {
  return 0;
 }
}
//获取当前登陆用户IP
function get_client_ip()
{
 if ($_SERVER['REMOTE_ADDR']) {
  $cip = $_SERVER['REMOTE_ADDR'];
 } elseif (getenv("REMOTE_ADDR")) {
  $cip = getenv("REMOTE_ADDR");
 } elseif (getenv("HTTP_CLIENT_IP")) {
  $cip = getenv("HTTP_CLIENT_IP");
 } else {
  $cip = "unknown";
 }
 return $cip;
}
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