Adding to array

[NZ_Kiwis]

I have this code which crates an array as a session, it works fine for my first row but can can I add more items to it???

If I run this code again it deletes old info and only leaves me with one row

$cart[] = array('Name' => $name, 'Qnty' => $qnty, 'Size' => $size, 'Color' => $color, 'NZD' => $NZD);
$_SESSION['cart'] = $cart; 

[NogDog]

$_SESSION['cart'][] = array('Name' => $name, 'Qnty' => $qnty, 'Size' => $size, 'Color' => $color, 'NZD' => $NZD);