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PHP RFC: array_column results grouping

Introduction

array_column ignores the duplicated rows for each similar columnt/index.

This RFC is adding a new boolean parameter to array_column to determine it's behaviour of grouping or not.

array_column(array $array, int|string|null $column_key, int|string|null $index_key = null, $grouping = null): array

Or we can implement it as a new function with something like

array_column_group(array $array, int|string|null $column_key, int|string|null $index_key = null)

And keep the same parameters.

No backward incompatible breaks.

Next PHP 8.x, currently PHP 8.2.

Standard ext

Include these so readers know where you are heading and can discuss the proposed voting options.