Conditional Tag for Checking Login/Logout?

The $user_ID global will be set for a logged on user, once get_currentuserinfo() has been called. However, this is actually always called at WP->init, so you don’t have to call it yourself.

So in a theme, you can just do:

if ($user_ID) {
// logged on
} else {
// not logged on
}

There’s various other globals too. $user_identity is the nickname, etc. Look in the link above for some of the various globals available to you.

For me, the $user_ID variable is empty even though I’m logged in. Any reasons why this might be occurring?