get_item($row_id)
update([$items = array()])
insert([$items = array()])
destroy()
class CI_Cart $product_id_rules = '.a-z0-9_-' These are the regular expression
total_items()
product_options([$row_id = ''])
remove($rowid)
contents([$newest_first = FALSE])
has_options($row_id = '')
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