Hi, how can I group sessions value? Example I have session 1,2,2,3,3,3,4 .Now I want to get sessions 1,2,3,4 only

im developing a mall system , inside the cart i want to determine which item from which store. if two or few items are from one store then shipping fees is consider 1 only instead of multiply bade on how many item. each store are charge 1 timr shipping fees knot

may i know how many time it repeat in an array?

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