results only show inside a foreach

results only show inside a foreach

i'm trying to grab the quantity of products in my session array but for
some reason if i have the below code it does not work
$amount = $array->products['quantity'];
I use the code below to get the zip out if the array - the array is a
multidimensional array
$amount = $array->products['quantity'];
But if i use a foreach i get the results i need (see below)
Foreach($array->products as $product){
$amount = $product->quantity;
echo $amount;
}
The problem is i have a foreach that calculates shipping rates and it
needs the quantity to multiple with the weight,so i can't use the above
foreach because the calculator uses a different one,
Please note: i'm new to php any help will be so great.
Does the array need to loop though to get the results or is it something
i'm missing?
Thanks for reading.