EllisLab/CodeIgniter — pull request #1320 by thallisphp (2012-05-03 19:13:27+00:00)
Title: Update system/libraries/Cart.php  -  To enable integrity when using associative arrays

For both examples below can pass through the same product, and to allow the use of arrays with multiple levels

```php
'4',
'Stickers per page' => '5'
)

$options = array(
'Pages' => '45'
)

$options = array(
'Stickers per page' => '45'
)

// or even
$id = '145';

// in all the same result

$row_id = md5( '145' )
```