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To: "G. P. B." <george.banyard@gmail.com>, Nikita Popov <nikita.ppv@gmail.com>
Cc: Dik Takken <d.takken@xs4all.nl>, PHP Development <internals@lists.php.net>
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Date: Tue, 21 May 2019 13:40:25 +0200
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Subject: Re: [PHP-DEV] Calling array_merge / array_merge_recursive without
 arguments
From: cmbecker69@gmx.de ("Christoph M. Becker")

On 21.05.2019 at 12:54, G. P. B. wrote:

> On Tue, 21 May 2019 at 10:29, Nikita Popov <nikita.ppv@gmail.com> wrote:
>
>> On Sat, May 18, 2019 at 9:37 PM Dik Takken <d.takken@xs4all.nl> wrote:
>>
>>> Good point. I did a quick scan of the source code and came up with a
>>> list of possible candidates for a similar treatment:
>>>
>>> array_map()
>>
>> This one makes sense in theory, because array_map(null, ...$arrays) is =
a
>> way to perform a zip operation in PHP. Unfortunately there is an ugly
>> special case if there is only a single array, which makes this not actu=
ally
>> usable in practice, unless you know that there are at least two arrays.=
 As
>> such, accepting zero arrays wouldn't be very useful unless we also want=
 to
>> fix that issue (PHP 8 maybe?)
>
> I'm not sure I totally understand the edge case, moreover this isn't
> currently documented.
> Mind sharing an example or explaining a bit more in detail such that I c=
an
> update the documentation?

If you pass only a single array to array_map(NULL, =E2=80=A6), you don't g=
et an
array of arrays, but a single flat array, see <https://3v4l.org/sqtqS>.

=2D-
Christoph M. Becker