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php shopping cart trouble

 
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Hello everyone,

please go to my site : click here

if you click "BUY NOW" at product on this site twice or more it shown duplicated.

Whereas normally when user click to buy product , it's supposed increase the quantity , and not duplicated.

Q : How to fix this problem?

please someone help me

Thanks

Note : if you need something please tell me.

 
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Hint: in your code, when someone clicks Buy Now a second time, does your code look to see if that item already appears in the shopping cart and if so just increments the quantity?
 
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