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：
复制代码 代码如下:
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
<?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
<?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
<?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
$msg="<table border='0' style='font-size: 10pt; color: white; font-family: verdana, arial;'>";
while ($line = mysql_fetch_array($result, mysql_assoc))
{
$msg = $msg . "<tr><td>" . $line["cdt"] . " </td>" .
"<td>" . $line["username"] . ": </td>" .
"<td>" . $line["msg"] . "</td></tr>";
}
$msg=$msg . "</table>";
echo $msg;
?>
4.聊天室页面：
chat.html
<!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=gb2312" />
<title>聊天页面</title>
<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>
</head>
<body onload="settxtname();">
<div style="border-right: black thin solid; border-top: black thin solid;
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; ">
<table style="width:100%; height:100%">
<tr>
<td colspan="2" style="font-weight: bold; font-size: 16pt; color: white; font-family: verdana, arial;
text-align: center">
聊天窗口--全球最大qq聊天交友网站</td>
</tr>
<tr>
<td colspan="2" style="font-weight: bold; font-size: 16pt; color: white; font-family: verdana, arial;
text-align: left">
<table style="font-size: 12pt; color: white; font-family: verdana, arial;border: white thin solid; ">
<tr>
<td style="width: 100px">
名字:</td>
<td style="width: 100px"><input id="txtname" style="width: 150px" type="text" name="name" maxlength="15" value="匿名" /></td>
</tr>
</table>
</td>
</tr>
<tr>
<td style="vertical-align: middle;" valign="middle" colspan="2">
<div style="width: 480px; height: 300px; border-right: white thin solid; border-top: white thin solid; font-size: 10pt; border-left: white thin solid; border-bottom: white thin solid; font-family: verdana, arial; overflow:scroll; text-align: left;" id="div_chat">
</div>
</td>
</tr>
<tr>
<td style="width: 310px">
<input id="txtmsg" style="width: 350px" type="text" name="msg" onkeydown="return clickbtn(this)"/></td>
<td style="width: 85px">
<input id="submit2" style="font-family: verdana, arial" type="button" value="发送" onclick="set_chat_msg()"/></td>
</tr>
<tr>
<td colspan="1" style="font-family: verdana, arial; text-align: center; width: 350px;">
</td>
<td colspan="1" style="width: 85px; font-family: verdana, arial; text-align: center">
</td>
</tr>
</table>
</div>
</body>
</html>
效果图如下：
更多关于php相关内容感兴趣的读者可查看本站专题：《php+mysql留言板开发专题》、《php+ajax技巧与应用小结》、《php文件操作总结》、《php运算与运算符用法总结》、《php网络编程技巧总结》、《php基本语法入门教程》、《php面向对象程序设计入门教程》、《php字符串(string)用法总结》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》
希望本文所述对大家php程序设计有所帮助。
【说明】：本文章由站长整理发布，文章内容不代表本站观点，如文中有侵权行为，请与本站客服联系(QQ:)！