Creating a Shopping Cart, and am wondering if when you add values to a
session, does it overwrite the current contents in the session?

For example:

                $this->Session->write('ShoppingCart.id', $id);
                $this->Session->write('ShoppingCart.name', $name);
                $this->Session->write('ShoppingCart.virtual', $virtual);
                $this->Session->write('ShoppingCart.price', $price);


Having this code, if the first time i passed an $id of 4, then next
time i added an $id of 6, will 6 overwrite 4 or will be added as
another row in the session?


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