Sum of an elemnt in option section of codeigniter cart - codeigniter

Question

Hello All Knowledgeable persons in codeigniter,
I am using codeigniter cart system.
Here's is the structure of my codeigniter cart
$data = array(
'id' => $id,
'qty' => $qty,
'price' => $price,
'name' => $name,
'options' => array(
'picture'=>$img,
'item_slug'=>$slug,
'item_color'=>$color,
'item_size'=>$size,
'unit_price'=>$price,
'order_type'=>$order_type,
'product_type'=>$pro_type,
'unit_discount' => 0.00,
'total_discount' => 0.00,
'discount_type' => '',
)
);
Now I want to get the total total_discount on the cart, which i can do by a code-snippet like this
$tot_discount = 0.00;
foreach($this->cart->contents() as $ci)
{
$tot_discount = floatval($tot_discount + $ci['options']['total_discount'];
}
Now my question is, is there any inbuilt cart function to get sum of any numeric field of the options section in codeigniter? say like $this->cart->total() gives the total price of the cart.
Or I need to use the above code snippet?
Thanks in advance

Answer 1

While working with cart library in codeigniter, there are some fix parameters for cart that you need to set and some are optional.
Fixed Parameters
'id' => $id,
'qty' => $qty,
'price' => $price,
'name' => $name
Optional Parameters
'options' => array();
Actually options variable holds additional product specific information as you have specified and they may change subject to your business requirement. Now we have a common function total() as mentioned below:
$this->cart->total()
If you'll read the method definition then you'll find that it utilizes 'price' parameter for getting the total cart amount. Now as you have declared the 'total_discount' inside 'options' array, so there is a custom business requirement. So you can utilize the "total()" method definition to create your own function like "totalDiscount" because it varies product to product.