PHP don't generate properly array from database (UBUNTU) - mysql

Question

I have a little problem.
There are two tables in my database: users and classes. The first one contains info about users, and the second one - about user classes and about access rights.
Now I'm extracting all data from there using this:
SELECT * FROM users NATURAL JOIN classes WHERE users.ID_User = '$id';
The mysql code works and returns a right array.
Now, when I'm doing next:
<?php
$result = mysql_query($sql_above);
$row = mysql_fetch_array($result);
print_r($row);
?>
... i'm getting this:
Array ( [0] => 1 [ID_User] => 1 [1] => John [Name] => John [2] => Doe [Surname] => Doe [3] => ... [16] => Owner [Class] => Owner [17] => [All] => [18] => [CanAuth] => [19] => [CanViewData] => [20] => [CanAddData] => [21] => [CanAlterData] => [22] => [CanDeactivateData] => [23] => [CanDeleteData] => [24] => [CanMgLocatari] => ... )
Columns from 17 till the end are access rights, noted in the database by 1 or 0. And there, they're missing.
Is there any option to enable in PHP configuration to correct this thing? Because on a Windows machine, the code executes properly and rights are working.
PHP Version 5.3.6-13ubuntu3.7 | Apache/2.2.20 (Ubuntu) | MySQL client version: 5.1.62
Please, reply. Thanks!