php - mysqli Object returned instead of result

I am running

$this->db->query("SELECT `id` FROM $table WHERE $table.id ='$product_id'");

that should return 92 but its returning the below why?

object(CI_DB_mysqli_result)#150 (8) { ["conn_id"]=> object(mysqli)#16
(18) { ["affected_rows"]=> int(1) ["client_info"]=> string(6) "5.5.30"
["client_version"]=> int(50530) ["connect_errno"]=> int(0)
["connect_error"]=> NULL ["errno"]=> int(0) ["error"]=> string(0) ""
["field_count"]=> int(1) ["host_info"]=> string(25) "Localhost via
UNIX socket" ["info"]=> NULL ["insert_id"]=> int(0) ["server_info"]=>
string(10) "5.5.31-cll" ["server_version"]=> int(50531) ["stat"]=>
string(150) "Uptime: 106781 Threads: 14 Questions: 30097132 Slow

queries: 13 Opens: 1937675 Flush tables: 1 Open tables: 400 Queries
per second avg: 281.858" ["sqlstate"]=> string(5) "00000"
["protocol_version"]=> int(10) ["thread_id"]=> int(373292)
["warning_count"]=> int(0) } ["result_id"]=> object(mysqli_result)#161
(5) { ["current_field"]=> int(0) ["field_count"]=> int(1)
["lengths"]=> NULL ["num_rows"]=> int(1) ["type"]=> int(0) }
["result_array"]=> array(0) { } ["result_object"]=> array(0) { }
["custom_result_object"]=> array(0) { } ["current_row"]=> int(0)
["num_rows"]=> NULL ["row_data"]=> NULL}

Answer

It is returning mysqli_ object.So Try to get the result like

$query = $this->db->query("SELECT `id` FROM $table WHERE $table.id ='$product_id'");
$result = $query->result(); 
foreach($result as $row)
{
     echo "Id is ".$row['id']."
";
}

And it is appreciable that you are using mysqli_* functions instead of deprecated mysql_* functions