fungsi untuk mendapatkan id

    function id()
    {
        $q=$this->db->query('select * from my_id');
        $r=$q->result_array();
        $id0=$r[0]['id'];
        $id1=$id0+1;
        $a=array('id'=>'');
        $q=$this->db->query("UPDATE   `my_id` SET
        `id` =  '$id1' WHERE   `id` =$id0");
        return $id1;

    }