'Adding all quantities of the same product and displaying it as one

I have 3 the same product name but different ID's. Their quantities are 12, 20 and 30. I want to add all of those quantities and display them as one. if I'm going to display it in the web it should look like this:

Potato chips = 62 pcs.

In short I want to display the overall quantity of the said product.

Im using php mysql btw.

phpxampp


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