[PHP-NOTES] note 130523 added to function.array-column

Unfortunately, the most "basic" index functionality has been overlooked: indexing the resulting array using the original index -- in other words, simply maintaining the original index and associating that with a chosen column from the array.

Consequently, one has to suffer additional overhead by resorting to some workaround, e.g.:

array_combine( array_keys( $array ), array_column( $array, 'some column' ) );
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