$cartname is the identifier of the shopping cart, which can be specified to ensure that there is no duplicate name and no related conflicts
$session_id is the session_id. The default is to use cookies for transmission. It can also be customized. It will only take effect if the storage type is session
$savetype storage type, including session and cookie methods
... Others are parameters required by cookie
When the program itself uses session, it is recommended to change this php shopping cart class to cookie method.
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