Who's online

[stelling]

Can anybody give me a quick hint how I can easily see who is logged in on a website. The login and authentication are already done, but I only want te be able to see who is online/logged in.

Thanks in advance,
Simon

[mrhappiness]

you'll never know exactly as http is a status-less protocol

only thing you can do:
add a new column in your usertable: name=last_action; typ=datetime

now in your function for checking the session do something like that:

function logged_in()
{
  $sql='UPDATE user SET UserSession=NULL WHERE (last_action + INTERVAL 15 MINUTE) < NOW()';
  mysql_query($sql);
  $sql="SELECT userid FROM user WHERE UserSession='".session_id()."'";
 return (mysql_num_rows(mysql_query($sql)) > 0);
}

[Weedpacket]

Searching the forum for the phrase users online will also be productive.