如何在会话中放入购物车总额

Question

I am building a shopping cart using sessions. How do I put the total amount in a session such that it changes as the user adds or removes from the shopping cart. This is the function I use in getting my total price:

public function grand_total($grand_total, $coupon){
    if ($coupon != 0){
      $discount = $grand_total * 0.1;
      $actual = $grand_total - $discount;
      return $actual;
    }else{
      return $grand_total;
    }
  }

On cart.php, where all items being bought are shown, I use this to display the total:

grand_total($grand_total, $discount);

How do I put this total in session such that it can be accessible in any page and also changes as items are added or removed?

Thank you.

Answer 1

You can access session using $_SESSION. So in your case, you can have

$_SESSION['grand_total'] = grand_total($grand_total, $discount)

whenever the grand total is updated.

And anywhere you want to display the grand total, just reference $_SESSION['grand_total'] , like

<?php echo $_SESSION['grand_total'] ? $_SESSION['grand_total'] : 0; ?>