PHP hundred lines of code to quickly build a simple chat room _ PHP Tutorial

PHP hundred lines of code quickly build a simple chat room. Bored, I saw that I could use less code to build a chat room. at the beginning, I wrote a full row of 100 lines to complete the chat room. later I felt that there was no function and I modified it again, when a lot of code is added and boring, you can use a relatively small amount of code to build a chat room. at the beginning, you wrote a full 100 lines to complete the chat room. later, you felt that there were no functions and modified them again, added a lot of code. In fact, we can do a good job in chatting rooms without using complex technologies such as templates and databases. it is suitable for individual users.

Basic functions: logging in, chatting, recording online user IP events, controlling the chat font color, automatically converting the chat URL into a link address, and customizing the chat room Title and advertisement information. If you are interested in using text as a storage media, you can refer to the code and scale it out.

In fact, php (as the mainstream development language) is a great script language for rapid development!

=== Code ===

/**
* Simple chat room for night travelers
* Author: heiyeluren
* Creation:
* Modification:
*/
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", "night passers-by chat room ");
Define ("AD_MSG", "Today is Chinese Valentine's day. I wish you a happy Valentine's Day !! ");

// Obtain the value
If (isset ($ _ GET [action]) &! Empty ($ _ GET [action]) {
$ Action = $ _ GET [action];
}

// If you have logged on, jump to the chat page.
If (! Isset ($ _ GET [action]) & isset ($ _ SESSION [username]) {
Header ("location:". SCRIPT ."? Action = chat ");
}

// Logon prompt
If (! Isset ($ _ GET [action])
{
If (! Session_is_registered (username ))
{
Echo"

[". CHAT_NAME."]©2005

";
Exit;
}
}

// Verify login
If ($ action = login)
{
If (isset ($ _ POST [login_user]) &! Empty ($ _ POST [login_user]) {
$ Username = $ _ POST [login_user];
} Else {
$ Username = "tourist ";
}
Session_register (username );
Save_online ($ username, get_client_ip ());
Header ("location:". SCRIPT ."? Action = chat ");
}

// Start chatting with www.acnow.net
If ($ action = "chat ")
{
$ Online_sum = get_online_sum ();
Echo"[". CHAT_NAME."]

". AD_MSG ." [Currently online: $ online_sum]
&lt;BR&gt; "; &lt;BR&gt; &amp; #125; &lt;/P&gt; &lt;P&gt; // User Interface &lt;BR&gt; if (&amp; #36; action =" say ") &lt;BR&gt; &amp; #123; &lt;BR&gt; echo "<pead&gt; &lt;title&gt; [". CHAT_NAME. "] &lt;/title&gt; </pead&gt; &lt;center&gt; &lt;body bgcolor = # C4BFB9 style = font-size: 12px;&gt; &lt;BR&gt; &lt;form action = ". SCRIPT. "? Action = save method = post name = chat onSubmit = return check ()&gt; &lt;BR&gt; [". &amp; #36; _ SESSION [username]. "] description: &lt;input type = text size = 80 maxlength = 500 name = chatmsg style = background-color: #99CC99; width: 550px; height: 22px; border: 1px solid: #000000&gt; &lt;/p&gt; &lt;p align = "left"&gt; &lt;p style = "display: none;"&gt; empty... &lt;/p&gt; &lt;p class = "art_confoot"&gt;