基于数据库的在线人数，日访问量等统计

可以实现在线人数统计，日访问量统计，月访问量统计。。。。。
$sql = "CREATE TABLE guestinfo(id integer DEFAULT 0 NOT NULL AUTO_INCREMENT,
ipaddress varchar(20),
host varchar(20),
cometime datetime,
refreshtime datetime,
leavetime datetime,
PRIMARY KEY(id),
UNIQUE id(id),
index guestinfo(id)
)";
mysql_query($sql, $connect);
?>
$duration = 300;
$sql = "select * from guestinfo where (leavetime is null or leavetime=) and ( UNIX_TIMESTAMP(NOW())-UNIX_TIMESTAMP(refreshtime))>$duration";
$result=@mysql_query($sql);
while($row=@mysql_fetch_array($result))
{
$id = $row[id];
$sql = "update guestinfo set leavetime=now() where id=$id";
mysql_query($sql);
}
$sql = "select * from guestinfo where ipaddress=$REMOTE_ADDR and (leavetime is null or leavetime=)";

$result = @mysql_query($sql);
if($row=@mysql_fetch_array($result))
{
$id = $row[id];
$sql="update guestinfo set refreshtime=now() where id=$id";
mysql_query($sql);
}
else
{
$sql = "insert into guestinfo(ipaddress,host,cometime,refreshtime)
values($REMOTE_ADDR,$REMOTE_HOST,now(),now())";
mysql_query($sql);
}
$date= mktime(0,0,0,date("m"),date("d"),date("Y"));
$sql = "select count(*) from guestinfo where UNIX_TIMESTAMP(refreshtime)> $date";
$result = mysql_query($sql);
if($result)
{
$row = mysql_fetch_array($result);
$todayaccess = $row["count(*)"];
}
else $todayaccess = 0;
$sql = "select count(*) from guestinfo where leavetime is null or leavetime=";
$result = mysql_query($sql);
if($result)
{
$row = mysql_fetch_array($result);
$nowonline= $row["count(*)"];
}
else $nowonline = 0;
mysql_close($connect);
?>
include("guest.php");

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补充：Web开发 , php ,