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Date: Sun, 22 Feb 2026 19:25:21 +0100
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To: Muhammed Arshid KV <arshidkv12@gmail.com>,
 Claude Pache <claude.pache@gmail.com>
Cc: internals@lists.php.net
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From: tim@bastelstu.be (=?UTF-8?Q?Tim_D=C3=BCsterhus?=)

Hi

The same comments as with your other RFC apply here.

On 2/20/26 18:37, Muhammed Arshid KV wrote:
> 1. Yes, *array_intersect_key() *and *array_diff_key() *can be used today,
> but the RFC proposes dedicated functions for better readability, less
> boilerplate, and potentially better performance and lower memory usage by
> avoiding temporary arrays.

Can you elaborate on what you mean by “lower memory usage by avoiding 
temporary arrays”?

> 2. Good point about naming. Making the key-filtering behavior explicit
> (e.g., *array_only_keys* and *array_except_keys*) improves clarity and
> avoids confusion.

I don't think that `array_(only|except)_keys()` is particularly clear. 
 From the naming I would expect it to return the array keys / values 
(i.e. do the same as `array_keys()` and `array_values()` respectively).

Best regards
Tim Düsterhus