采用行写方式的聊天程序（之二）_PHP

lt1.php:
该程序为整个系统的入口，含有两个全局参数：chat_hh,uname分别记录当前最大的发言序号和发言者名称


session_start();
session_register("chat_hh");
session_register("uname");


//取数据库最大编号
include("g_fun.php");
f_connectdb();
$query = "select max(lt_id) as rmaxid from lt_t_content";
$res = mysql_query($query, $dbh);
$row = mysql_fetch_array($res);
$f_chat_hh = $row["rmaxid"];
if (empty($f_chat_hh)) { $f_chat_hh = 0; }
if ($f_chat_hh > 12 ) {
$chat_hh=$f_chat_hh - 12;
} else
$chat_hh=$f_chat_hh;

$un_len=strlen($name);
$uname=$name;

//增加在线人员信息
$query = "select count(*) as rcount from lt_t_online where lt_username = '".$name."'";
$res = mysql_query($query, $dbh);
$row = mysql_fetch_array($res);
$lcount = $row["rcount"];
if ($lcount == 0) {
$query = "insert into lt_t_online(lt_username,lt_lasttime) values(";
$query .= "'".$name."',now())";
$res = mysql_query($query, $dbh);
}
$query = "update lt_t_online set lt_lasttime = now(),lt_state = '0' ";
$query .= " where lt_username = '".$name."'";
$res = mysql_query($query, $dbh);
?>