$_SESSION['cart'] = [ 123 => 2, // product_id => quantity 456 => 1 ];
A truly high-quality cart system does three things exceptionally well: addcartphp num high quality
When the “Add to Cart” form is submitted, the num value arrives in $_POST['num'] . handling requires: $_SESSION['cart'] = [ 123 => 2, // product_id
at the beginning of your script to initialize a shopping cart array in the user's session. Validation $_SESSION['cart'] = [ 123 =>