SQL query:  

$sql = "SELECT user_id, username, user_allow_viewonline, user_level, user_session_time 
   FROM ".USERS_TABLE. " 
   WHERE user_id > 0 
   ORDER BY user_level DESC, username ASC";



MySQL said:  

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '$sql = "SELECT user_id, username, user_allow_viewonline, user_level, user_sessio' at line 1