聊天室php&mysql(二)

//第二页面 name="frame2.php"




include "../signup/MySQL.php";
header("Expires: Sun, 28 Dec 1997 09:32:45 GMT");
header("Cache-Control: no-cache, must-revalidate");
header("PRagma: no-cache");
header("Content-Type: text/html; charset=${Charset}");



$current_time=time();
$delete_time=$current_time-40;
$sql="delete from chat_user where last_time mysql_query($sql)or die(" false again");



$sql="update chat_user set last_time='$current_time' where userid='$userid'";
mysql_query($sql) or die("false");

$sql="select userid from chat_user";
$result=mysql_query($sql)or die("fallse");
$online=mysql_num_rows($result);
?>