        function UserExist($user){
                $this->db->select('username');
                $this->db->from('users');
                $this->db->where('username', $user);
        
                $q = $this->db->get();
        
                if($q->num_rows() == 1){
                        return TRUE;
                } else {
                        return FALSE;
                }
        
        }

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