Tài liệu WebChat part 3

Finally, $chat_buffer is ended with a footer stating that the end of the
occupants list has been reached.
$chat_buffer .=
<P><H2>End of Occupants List</H2><P>;
} # End of occupants processing
PROCESS CHAT MESSAGES
The next part of the chat script processes the chat messages for display to
the user. Here, there is one thing to take into consideration: frames. If
frames are activated, the chat program should display messages only if it
has been called upon to read messages ($fmsgs is on). If the main frame
HTML document is being output ($frames is on) or if the message submit
frame is being output ($fsubmit), the script will not enter the part of the
script that processes messages.
if ($fmsgs eq on ||
($frames ne on &&
$fsubmit ne on)) {