本文实例讲述了PHP+mysql+ajax轻量级聊天室实现方法。分享给大家供大家参考，具体如下：
做了一个QQ聊天交友网站，想加个聊天的功能，于是做完用PHP做了简单又强大的聊天室
1. 创建mysql数据库表：
create table chat( id bigint AUTO_INCREMENT,username varchar(20), chatdate datetime,msg varchar(500), primary key(id));
2.编写建议连接数据库函数：
dbconnect.php
function db_connect()
{
date_default_timezone_set("Asia/Shanghai");
$link = mysql_connect("xxx.xxx.xxx.xxx", "databasename", "password")
or die("无法连接: " . mysql_error());
mysql_select_db("databasename") or die("没有你找到指定数据库");
return true;
}
function quote($strText)
{
$Mstr = addslashes($strText);
return """ . $Mstr . """;
}
function isdate($d)
{
$ret = true;
try
{
$x = date("d",$d);
}
catch (Exception $e)
{
$ret = false;
}
echo $x;
return $ret;
}
?>
3. 编写ajax发送和接收函数：
ajax发送函数chat_send_ajax.php
require_once("dbconnect.php");
db_connect();
$msg = iconv("UTF-8","GB2312",$_GET["msg"]);
$dt = date("Y-m-d H:i:s");
$user = iconv("UTF-8","GB2312",$_GET["name"]);
$sql="INSERT INTO chat(USERNAME,CHATDATE,MSG) " .
"values(" . quote($user) . "," . quote($dt) . "," . quote($msg) . ");";
echo $sql;
$result = mysql_query($sql);
if(!$result)
{
throw new Exception("Query failed: " . mysql_error());
exit();
}
?>
ajax接收函数chat_recv_ajax.php
header("Content-Type:text/html;charset=gb2312");
header("Expires: Thu, 01 Jan 1970 00:00:01 GMT");
header("Cache-Control: no-cache, must-revalidate");
header("Pragma: no-cache");
require_once("dbconnect.php");
db_connect();
$sql = "SELECT *, date_format(chatdate,"%Y年%m月%d日 %r") as cdt from chat order by ID desc limit 200";
$sql = "SELECT * FROM (" . $sql . ") as ch order by ID";
$result = mysql_query($sql) or die("Query failed: " . mysql_error());
// Update Row Information
$msg="";
while ($line = mysql_fetch_array($result, MYSQL_ASSOC))
{
$msg = $msg . "" . $line["cdt"] . " " .
"" . $line["username"] . ": " .
"" . $line["msg"] . "";
}
$msg=$msg . "";
echo $msg;
?>
4.聊天室页面：
chat.html
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script type="text/javascript">
var t = setInterval(function(){get_chat_msg()},5000);
//
// General Ajax Call
//
var oxmlHttp;
var oxmlHttpSend;
function get_chat_msg()
{
if(typeof XMLHttpRequest != "undefined")
{
oxmlHttp = new XMLHttpRequest();
}
else if (window.ActiveXObject)
{
oxmlHttp = new ActiveXObject("Microsoft.XMLHttp");
}
if(oxmlHttp == null)
{
alert("浏览器不支持XML Http Request！");
return;
}
oxmlHttp.onreadystatechange = get_chat_msg_result;
oxmlHttp.open("GET",encodeURI("chat_recv_ajax.php"),true);
oxmlHttp.send(null);
}
function get_chat_msg_result()
{
if(oxmlHttp.readyState==4 || oxmlHttp.readyState=="complete")
{
if (document.getElementById("DIV_CHAT") != null)
{
document.getElementById("DIV_CHAT").innerHTML = oxmlHttp.responseText;
oxmlHttp = null;
}
var scrollDiv = document.getElementById("DIV_CHAT");
scrollDiv.scrollTop = scrollDiv.scrollHeight;
}
}
function set_chat_msg()
{
if(typeof XMLHttpRequest != "undefined")
{
oxmlHttpSend = new XMLHttpRequest();
}
else if (window.ActiveXObject)
{
oxmlHttpSend = new ActiveXObject("Microsoft.XMLHttp");
}
if(oxmlHttpSend == null)
{
alert("浏览器不支持XML Http Request！");
return;
}
var url = "chat_send_ajax.php";
var strname="noname";
var strmsg="";
if (document.getElementById("txtname") != null)
{
strname = document.getElementById("txtname").value;
document.getElementById("txtname").readOnly=true;
}
if (document.getElementById("txtmsg") != null)
{
strmsg = document.getElementById("txtmsg").value;
document.getElementById("txtmsg").value = "";
}
url += "?name=" + strname + "&msg=" + strmsg;
oxmlHttpSend.open("GET",encodeURI(url),true);
oxmlHttpSend.send(null);
}
function clickBtn(e)
{
if(window.event.keyCode==13)
{
var id=e.id;
switch(id)
{
case "txtmsg":
document.getElementById("Submit2").click();
window.event.returnValue=false;
break;
}
}
}
function fRandomBy(under, over){
switch(arguments.length){
case 1: return parseInt(Math.random()*under+1);
case 2: return parseInt(Math.random()*(over-under+1) + under);
default: return 0;
}
}
function SetTxtName(){
var i=fRandomBy(10);
if(i==0)document.getElementById("txtname").value="无敌战神";
if(i==1)document.getElementById("txtname").value="令狐冲";
if(i==2)document.getElementById("txtname").value="西门吹雪";
if(i==3)document.getElementById("txtname").value="超级玛丽";
if(i==4)document.getElementById("txtname").value="奥巴马";
if(i==5)document.getElementById("txtname").value="恐怖分子";
if(i==6)document.getElementById("txtname").value="聊斋奇女子";
if(i==7)document.getElementById("txtname").value="天朝?潘?;
if(i==8)document.getElementById("txtname").value="中500万了";
if(i==9)document.getElementById("txtname").value="神级奇葩";
if(i==10)document.getElementById("txtname").value="爱你不是两三天";
}
</script>
border-left: black thin solid; border-bottom: black thin solid;
background:#fff url("http://www.ihaonet.com/chat/blue.jpg") repeat-x left top;
height: 450px;width: 500px; ">
text-align: center">
聊天窗口--全球最大QQ聊天交友网站
text-align: left">
名字:
效果图如下：
php mysql apache 集成环境_PHP+mysql+ajax轻量级聊天室
http://m.bbyears.com/jiaocheng/112173.html
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