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PHP program hundred lines of code to quickly build a simple chat room Method

Source: Internet
Author: User
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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 is a great scripting language for rapid development!

=== Code ===

Reference content is as follows:
<? Php
/**
* 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 "<p>

<P align = center>
<Form action = ". SCRIPT ."? Action = login method = post>
<Input type = text size = 25 maxlength = 30 name = login_user>
<Input type = submit value = chat>
</Form> </p>
";
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 www.knowsky.com
If ($ action = "chat ")
{
$ Online_sum = get_online_sum ();
Echo "<Body bgcolor = # C4BFB9 style = 'font-size: 12px; '>
<Div style = 'border: 1px solid #999966; width: 802px; height: 450 '>
<Iframe src = '". SCRIPT ."? Action = show'
Name = show_win width = 800 height = 450 scrolling = auto frameborder = 0> </iframe>
</Div> <br>
<Marquee width = 70% scrollamount = 2> ". AD_MSG." </marquee> & nbsp;
[Currently online: $ online_sum]
<Iframe src = '". SCRIPT ."? Action = say 'name = say_win width = 800
Height = 60 scrolling = no frameborder = 0>
";
}

// Speaking Interface
If ($ action = "say ")
{
Echo "<Body bgcolor = # C4BFB9 style = 'font-size: 12px; '>
<Form action = ". SCRIPT ."? Action = save method = post name = chat
OnSubmit = 'Return check () '>
[". $ _ SESSION ['username']."]: <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'> default COLOR </OPTION>
<OPTION style = 'color: #000000 'value =' #000000 '> black silence </OPTION>
<Option style = 'color: # ff000000' value = '# ff000000'> Red enthusiasm </option>
<Option style = 'color: # 0000ff 'value =' # 0000FF '> blue and cheerful </option>
<Option style = 'color: # ff00ff 'value =' # FF00FF '> peach romance </option>
<Option style = 'color: #009900 'value =' #009900 '> green youth </option>
<Option style = 'color: #009999 'value =' #009999 '> cyan refreshing </option>
<Option style = 'color: #990099 'value =' #990099 '> purple </option>
<Option style = 'color: #990000 'value =' #990000 '> dark night excitement </option>
<Option style = 'color: #000099 'value =' #000099 '> deep blue and melancholy </option>
<Option style = 'color: #999900 'value =' #999900 '> card the uniform </option>
<Option style = 'color: # ff9900 'value = '# FF9900'> golden years </option>
<Option style = 'color: # 0099ff 'value =' # 0099FF '> Lake ripple </option>
<Option style = 'color: # 9900ff 'value =' # 9900FF '> shiny blue-violet </option>
<Option style = 'color: # ff0099 'value =' # FF0099 '> suggestion of love </option>

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