Automatically add multiple products with attribute to cart from external source

[michael_s]

This file will allow you to create a URL string that will automatically add multiple products and attributes to the cart and display the cart. All you need to do is put this file in the root of your store and then create the URL.

eg of URL:
http://www.yourdomain.com/catalog/addproducts.php?product_id=40{1}2,40{1}5,43{3}4

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