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;

$sql="delete from chat_user where last_time<".$delete_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);

?>

&nbsp;

&nbsp;