Re: RFC [Discussion] array_column results grouping

> > Hello Folks, Thanks a lot for your feedback, as already mentioned in > the RFC and as mentioned by Rowan too a new function is an option. I > think that mostly we will go with the new function option. > I will try to edit the PR to add a new function, does there any > suggestions/naming conventions for the new function? a colleague > suggested being array_group_by and Hendra already suggested to > be > array_column_group which is good too. It would be better if You add another voting item for this one. In my opinion, column is less important to be included, and array_group is sufficiently descriptive. reducer is one of the candidates to be included. Additionally, there are mapper, filter, and sorter. So Obviously we need a new function, rather than modify the old one. To be clear and to make it simpler, all callbacks operate on the deepest subgroup. Signature: reducer(array|object $item, int|string $index, mixed $cumulative): mixed mapper(array|object $item): array|object filter(array|object $item, int|string $index): bool sorter(array|object $item1, array|object $item2): int A note in case you are able to implement them: - reducer and mapper cannot coexist in a single function call. - filter should be executed before reducer or mapper. - sorter should be decided whether it executes before or after reducer/ mapper: sorter is more suitable to execute before filter, but more suitable after mapper. A note for consumers: - mapper is designed to operate on the subgroup item, but it can be operated on the field value of the item. - filtering can be done inside reducer or mapper, but the number of subgroup members is as it is. With dedicated filter supplied, we can decrease the number. - If You want to filter an intermediate group, You can use unset or if-else $group = array_group($people, ["education", "sex"], FN_REDUCER); foreach ($group as &$eduGroup) { foreach ($eduGroup as &$sexGroup) { unset($sexGroup["male"]); } } Not a perfect solution, but at least your code is reduced. Best Regards Hendra Gunawan.