Tài liệu WebChat part 4

user information fields are joined by the pipe symbol and are written to
the file as a single line. Finally, the file is closed and the newly created
session code is returned from the subroutine.
open (SESSIONFILE, >$chat_session_dir/$session_file);
print SESSIONFILE join (|, @fields);
print SESSIONFILE
;
close (SESSIONFILE);
$session;
} # End of MakeSessionFile