上面已经介绍了系统的关键技术，下面对具体实现进行详解；
1.开发时，经常需要利用一个配置文件来存储系统的参数，例如：数据库连接信息等。这样可以提高系统的可移植性，当系统的配置发生变化时，例如：更改服务器，就不用修改散布在各个页面的数据库连接信息，而只需修改配置文件即可。
下面创建一个系统配置文件sys_conf.inc,用来保存数据库连接信息：
1 <!--sys_conf.inc：系统配置文件------------------------------>2 <?php3 //数据库配置全局变量4 $DBHOST="localhost";5 $DBUSER="root";6 $DBPWD="";7 $DBNAME="my_chat";8 ?>
可以通过require（）或include（）函数在其他页面引用sys_conf.inc文件，从而得到数据库配置信息。
其中第4-7行分别定义了$DBHOST、$DBUSER、$DBPWD、$DBNAME，分别用来保存数据库服务器名、登陆用户名、密码和数据库名。大家可根据需要自行修改。
2.登陆界面（login.php）
<!--login.php：My聊天室用户登录页面-----------------------><html> <head> <title>用户登录</title> </head> <body> <center> <h1 id="欢迎来到My聊天室">欢迎来到My聊天室</h1> <h2>请输入您的昵称<h2> <form action="main.php" method="post" target="_self"> <input type="text" name="nick" cols="20"> <input type="submit" value="登录"> </form> </center> </body></html>
注：11-13行定义了一个表单，其中包括昵称输入框nick，提交按钮“登录”，当用户单击该按钮时，通过form的action属性，页面将nick输入框中的信息使用post方式提交至聊天主页面main.php
3.聊天室主页面（main.php）：
需要使用HTML框架技术，把整个浏览器分为几个独立的页面，每个页面成为其中一个框架，并相互独立，这样页面就不会随着显示留言页面一起自动刷新了。
<?php session_start(); //装载Session库，一定要放在首行 $user_name=$_POST["nick"]; session_register("user_name"); //注册$user_name变量,注意没有$符号 ?><!--chat.php：My聊天室主页面-----------------------><html> <title>My聊天室</title> <frameset rows="80%,*"> <frame src="chat_display.php" name="chat_display"> <frame src="speak.php" name="speak"> </frameset></html> 第10-13行使用了框架，使整个浏览器窗口包含两个页面，分别是留言显示页面chat_display.php和用户发言页面speak.php。这样，对于自动刷新的问题，就可以独立放在chat_display.php。
4.显示发言页面（chat_display.php）
1 <!--chat_display.php：显示留言页面-----------------------> 2 <html> 3 <head> 4 <title>显示用户留言</title> 5 <meta http-equiv="refresh" content="5;url=chat_display.php"> 6 </head> 7 <body> 8 <?php 9 require_once("sys_conf.inc"); //系统配置文件，包含数据库配置信息10 11 //连接数据库12 $link_id=mysql_connect($DBHOST,$DBUSER,$DBPWD); 13 mysql_select_db($DBNAME); //选择数据库my_chat14 $str="select * from chat ORDER BY create_time;"; //按找发表时间查找所有聊天信息15 $result=mysql_query($str, $link_id); //执行查询16 $rows=mysql_num_rows($result); //取得查询结果的记录笔数17 18 //取得最后15个发言，并显示19 @mysql_data_seek($resut,$rows-15); //移动记录指针到前15笔记录20 if ($rows<15) $l=$rows; else $l=15; //记录总数小于15，则最多为该记录数21 for ($i=1;$i<=$l;$i++) 22 {23 list($cid,$author,$create_time,$text)=mysql_fetch_row($result);24 echo $create_time; echo " ";echo "【".$author."】"; echo"说到：" ; echo $text; echo "<BR>";25 }26 27 //清除库中过时的数据28 @mysql_data_seek($result,$rows-20); //移动记录指针到前20笔记录29 list($limtime)=mysql_fetch_row($result);30 $str="DELETE FROM chat WHERE create_time<'$limtime';" ;31 $result=mysql_query($str,$link_id); //执行查询字符串,库中只留最后20个记录32 33 //关闭数据库34 mysql_close($link_id);35 ?>36 </body>37 </html> 第9行，通过require_once()函数来引入系统配置文件，以使用数据库连接信息。
第11-15行，使用mysql_query（）函数进行数据查询，得到chat表中所有数据
第24行，按“时间+用户+发言内容”的格式将发言输出
第27-31行，删除数据库中旧的发言信息，这样可以保证数据库的存储量保持一定的值，同样是使用mysql_query()函数向服务器提交查询。
5.发言页面（speak.php）
用户的发言过程是写数据库的过程，把用户的发言信息和发言时间及用户名一起保存到chat表中。在chat_display.php上可以读取这些数据并显示出来。
1 <?php session_start(); ?> 2 <!--speak.php：用户发言页面-----------------------> 3 <html> 4 <head> 5 <title>发言</title> 6 </head> 7 <body> 8 <?php 9 require_once("sys_conf.inc"); //系统配置文件，包含数据库配置信息10 11 //发言12 if(isset($_POST["text"]))13 {14 //连接数据库15 $link_id=mysql_connect($DBHOST,$DBUSER,$DBPWD); 16 mysql_select_db($DBNAME); //选择数据库my_chat17 $time=date("h:i:s");18 $author=$_SESSION["user_name"];19 $text=$_POST["text"];20 $str="INSERT INTO chat(create_time,author,text) values('$time','$author','$text')" ; 21 mysql_query($str,$link_id); //送出发言到数据库22 mysql_close($link_id);23 }24 ?>25 <!--输入发言的表单-->26 <form action="speak.php" method="post" target="_self">27 <input type="text" name="text" cols="20">28 <input type="submit" value="发言">29 </form>30 </body>31 </html> 第1行，使用session_start（）函数初始化session库，这样就可以使用已注册的session变量user_name来得到用户的昵称了，具体的数据库获取在第18行使用全部数组$_SEESSION实现。
第9行，通过require_once（）函数来引入系统配置文件，以使用数据库连接信息。
第12-23行，实现了数据库的插入操作。
第26-29行定义了HTML表单，包含一个发言输入框text和提交按钮“发言”
至此，一个简单的聊天室制作就完成了。大家可以根据喜好做一些个性化的设计，如增加一个页面显示当前聊天室人员名单、发送表情、进一步美化页面等······
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