Develop Methods for emptying all baskets / checkout of all baskets, PHP

It is necessary to make 2 methods that will be run by the administrator and managers from administrators:

Empty all Recycle Bins. that is, all user recycle bins must be deleted
Checkout of all carts to order. That is, all products from users in the baskets must be placed in the order. There may be a nuance with the Pre-order of Holland, since it has three download speeds and in the cart for ordering you need to choose one of 3 dates