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Can't have the Cart total for a CartRule


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I'd like to change the way that the cart rule works.


In order to do that, I check if the cart rule's reduction amount is higher than the cart total for the products. 


If it's the case, it use product + shipping instead of only the product.


But in my CartRule.php class, if I want the result of getOrderTotal($use_tax, Cart::BOTH) (or even getOrderTotal($use_tax, Cart::ONLY_SHIPPING)),  instead of getOrderTotal($use_tax, Cart::ONLY_PRODUCTS), I have a Fatal error : memory limit, even if I put the memory limit to 512Mo.


How can I know where it comes from ?



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