[Logician]

insert:
echo "warnfield=$warnfield <br>";
echo "bbuserinfo=$bbuserinfo<br>";
before
$warnlevel = $DB_site->query_first("SELECT $warnfield FROM userfield WHERE userid='$bbuserinfo'");

and see what your variables have before entering the query.

BTW isnt it the variable "$bbuserinfo[userid]" you should use in your query if I got what you're trying to do right?

if yes try this:
$new_var_323= $bbuserinfo[userid];
$warnlevel = $DB_site->query_first("SELECT $warnfield FROM userfield WHERE userid='$new_var_323'");

Hope this helps..

Regards,
Logician