session_id() returning no value

[jscix]

ok, below is the code i'm using, however i've also tried logging in, and using an echo session_id();

this isn't working either, I've  started the session, it shows up in my sess directory, the variables are being maintained in the session but, session_id() wont return the id.. any idea what could be causing this?

 

This is all the relevant code in using..

 

session_save_path("tmp/login/");
session_start();

#bunch of stuff between here 

$setkeys = mysql_query("UPDATE `users` SET `ip` = '" . getenv("REMOTE_ADDR") . "', `sessid` = '" . session_id() . "' WHERE `users`.`uid` =" . $result['0'] . " LIMIT 1 ;");

 

Anyone? :/