By Collection

array(3) { [0]=> string(5) "50000" [1]=> string(5) "50010" [2]=> string(5) "50001" } array(3) { [50000]=> string(6) "172 CM" [50010]=> string(6) "200 CM" [50001]=> string(6) "140 CM" } array(3) { [50001]=> string(6) "140 CM" [50000]=> string(6) "172 CM" [50010]=> string(6) "200 CM" }

array(2) { [0]=> string(5) "10139" [1]=> string(5) "10138" } array(2) { [10139]=> string(6) "170 CM" [10138]=> string(6) "140 CM" } array(2) { [10138]=> string(6) "140 CM" [10139]=> string(6) "170 CM" }