multiple value (or) in php variable is possible?

Question

is possible multiple value in php variable with condition (or). such as like this

$shippingCost = $selectedShipping['cost'] || null;

I've tried but it gives return error

Answer 1

We use ternary operators to assign values to parameter when there are conditions to check. otherwise you can simply use if else conditions as well

using ternary operator 

$shippingCost = isset($selectedShipping['cost']) ? $selectedShipping['cost'] : null

using if,else

$shippingCost = 0;
if(isset($selectedShipping['cost'])){
  $shippingCost = $selectedShipping['cost'];
}