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How to use a variable from one tpl in another without getting an undefined index error


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Hey there;


I'm looking to take a variable called $quantity_discount that can be found in:


And put it in:



However when doing it i get the following error:

ContextErrorException in smarty_internal_templatebase.php(157) : eval()'d code line 311:
Notice: Undefined index: quantity_discount


As you may have guessed I'm trying  to show special offers in the catalog page. But i'm also just curious how you are supposed to do this in general for other modifications.


Finally, where would be a good lace to learn about this properly? I haven't been able to find any good documentation that is not fragmented or assumes a much higher level of understanding of how this works than i currently have. 

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