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Simple shopping cart not working - undefined index


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I am building a shopping cart with three tables in one database and when I am trying to pass the quantity of an item to my product_handler file I am getting an undefined index error regarding my variable QTY.


I thought this error was due to the name being typed incorrectly because that's when I've seen this before, but I can't figure out why this isn't working.


Here is my error:


Notice: Undefined index: QTY in C:\xampp\htdocs\xyzlabs3\product_handler.php on line 4


I have attached the product page and the product_handler page and I'm hoping someone can help.



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