whats the variable used for a logged in user?

[guwebby]

Im trying to work on my own hack, and what im trying to do is this:

If a user is logged in and views his own profile, his profileviews doesnt get a +1, if he views another persons profile, they get a +1.

PHP Code:

if ($_GET['u'] != $userinfo['userid']) {

$db->query ("UPDATE " . TABLE_PREFIX . "user SET profileviews=profileviews+1 WHERE userid = '".$_GET[u]."' OR userid = '".$userinfo[userid]."' ");

} 


Thats what I did but obviously something isnt right (since Im using the $userinfo['userid'] twice)

So can someone tell me what is used to let the script know your logged in

(because im pretty sure $userinfo['userid'] is to display the users profile stuff, not for the logged in user)