PHP-based chat room programming

1. Basic elements of page login
You can see the login form in my bamboo. Here we provide the most basic login form items.
(1) login form
<Form method = POST name = chatform action = chat/login. php? Action = enter onSubmit = "b1_submit (); return true;" target = "howtodo">
(A) the chat form is named chatform. I use action = enter as the portal to enter the chat room. If this parameter is not provided, the login page is displayed.
(B) when submitting a form, call bw.submit () to create a chat window.
(C) the target chat window is the howtodo window created by b1_submit ().
(2) form items
Nickname: <input type = text name = name size = 15 maxlength = "10">
Password: <input type = password name = pass size = 15 maxlength = "10">
<Input type = submit name = submit value = Login style = "width: 100">
<Input type = reset name = reset value = Add style = "width: 50">
(A) the maximum allowed length of each form item must be set. maxlength
(3) Create a chat window js
<Script LANGUAGE = "javascript">
Function BMIT submit (){
Chat = window. open (''," howtodo ", 'status = no, scrollbars = no, resizable = no ');
Chat. moveTo (0, 0 );
Chat. resizeTo (screen. availWidth, screen. availHeight );
Chat. outerWidth = screen. availWidth;
Chat. outerHeight = screen. availHeight;
}
This code first opens a howtodo window with no status bar and a scroll bar to adjust the size! Move to the upper left corner of the screen and zoom in to the allowed screen size.
Chatroom programming ideology-gate-pass
Portal-pass
The chat room can run in a completely free way. You can enter the name at will, without a password, and do not save your chat status. The advantage is: freedom, which is very suitable for tourists! Another method is to register a chat room. Every person entering the chat room must enter his/her username and password before entering the room! Advantage: it fully reflects the personality and is very suitable for old friends. What do they say will not be maliciously occupied and used? My chat room uses the registration method!
Registration usually uses two methods: 1. Register first and then enter the chat; 2. Automatically add the book, and then modify your own information in it! I use 2nd methods !! The username of each new user will be automatically saved to the database. You must enter an accurate password for the next login!
The following is the judgment part! This program uses a text database!
// $ Useronline is the name of the online user's data file
// $ Useronlinelock is the identifier of the online user
// $ Register is the name of the registered data file