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Date: Wed, 17 Jul 2024 10:29:34 +1000
Message-ID: <CAKVXxD_=0=P2uCgSmkA-6pN3E-Gm-rwKL6S-C066+xJt+qzmSg@mail.gmail.com>
Subject: Re: [PHP-DEV] array_reduce callback key
To: Bilge <bilge@scriptfusion.com>
Cc: PHP Internals List <internals@lists.php.net>
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From: mickmackusa@gmail.com (mickmackusa)

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This is not the first time that a developer needs access to the input
array's keys within the callback of array_reduce().
It is untrue that you "can't access it"; you just need to use an array of
keys as the input array.

Some frameworks already have the feature of key access built into their
methods/functions.
https://laravel.com/docs/11.x/collections#method-reduce

Examples of passing array_keys to array_reduce (some of which are more than
a decade old):
https://stackoverflow.com/a/10196070/2943403
https://stackoverflow.com/a/27419768/2943403
https://stackoverflow.com/a/27809675/2943403
https://stackoverflow.com/a/32226816/2943403
https://stackoverflow.com/a/33372066/2943403
https://stackoverflow.com/a/37728665/2943403
https://stackoverflow.com/a/39322532/2943403
https://stackoverflow.com/a/45508817/2943403
https://stackoverflow.com/a/48664250/2943403
https://stackoverflow.com/a/49035053/2943403
https://stackoverflow.com/a/57966850/2943403
https://stackoverflow.com/a/58997848/2943403
https://stackoverflow.com/a/73726419/2943403
https://stackoverflow.com/a/76196482/2943403

mickmackusa


On Wed, 17 Jul 2024, 09:15 Bilge, <bilge@scriptfusion.com> wrote:

> Hi Internals,
>
> I just ran into a case where I needed the array key in an array_reduce()
> callback, but I can't access it :(
>
> So I wrote a PR to fix it: https://github.com/php/php-src/pull/14986
>
> What do you think? Does this need an RFC?
>
> Cheers,
> Bilge
>

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<div dir=3D"ltr"><div dir=3D"auto">This is not the first time that a develo=
per needs access to the input array&#39;s=C2=A0keys within the callback of =
array_reduce().</div><div>It is untrue that you=C2=A0&quot;can&#39;t access=
 it&quot;; you just need to use an array of keys as the input array.</div><=
div><br></div><div>Some frameworks already have the feature of key access b=
uilt into their methods/functions.</div><div><a href=3D"https://laravel.com=
/docs/11.x/collections#method-reduce">https://laravel.com/docs/11.x/collect=
ions#method-reduce</a><br></div><div><br></div><div>Examples of passing arr=
ay_keys to array_reduce (some of which are more than a decade old):</div><d=
iv><a href=3D"https://stackoverflow.com/a/10196070/2943403">https://stackov=
erflow.com/a/10196070/2943403</a><br></div><div><a href=3D"https://stackove=
rflow.com/a/27419768/2943403">https://stackoverflow.com/a/27419768/2943403<=
/a></div><div><a href=3D"https://stackoverflow.com/a/27809675/2943403">http=
s://stackoverflow.com/a/27809675/2943403</a><br></div><div><div><a href=3D"=
https://stackoverflow.com/a/32226816/2943403">https://stackoverflow.com/a/3=
2226816/2943403</a></div><div><a href=3D"https://stackoverflow.com/a/333720=
66/2943403">https://stackoverflow.com/a/33372066/2943403</a></div><div><a h=
ref=3D"https://stackoverflow.com/a/37728665/2943403">https://stackoverflow.=
com/a/37728665/2943403</a><br><a href=3D"https://stackoverflow.com/a/393225=
32/2943403">https://stackoverflow.com/a/39322532/2943403</a><br></div><div>=
<a href=3D"https://stackoverflow.com/a/45508817/2943403">https://stackoverf=
low.com/a/45508817/2943403</a><br></div><div><div><a href=3D"https://stacko=
verflow.com/a/48664250/2943403">https://stackoverflow.com/a/48664250/294340=
3</a></div></div><div><a href=3D"https://stackoverflow.com/a/49035053/29434=
03">https://stackoverflow.com/a/49035053/2943403</a><br></div><div><a href=
=3D"https://stackoverflow.com/a/57966850/2943403">https://stackoverflow.com=
/a/57966850/2943403</a></div><div><a href=3D"https://stackoverflow.com/a/58=
997848/2943403">https://stackoverflow.com/a/58997848/2943403</a><br></div><=
div><a href=3D"https://stackoverflow.com/a/73726419/2943403">https://stacko=
verflow.com/a/73726419/2943403</a></div></div><div><a href=3D"https://stack=
overflow.com/a/76196482/2943403">https://stackoverflow.com/a/76196482/29434=
03</a></div><div><br></div><div>mickmackusa</div><div><br></div></div><br><=
div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, 17 =
Jul 2024, 09:15 Bilge, &lt;<a href=3D"mailto:bilge@scriptfusion.com" target=
=3D"_blank">bilge@scriptfusion.com</a>&gt; wrote:<br></div><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid r=
gb(204,204,204);padding-left:1ex">Hi Internals,<br>
<br>
I just ran into a case where I needed the array key in an array_reduce() <b=
r>
callback, but I can&#39;t access it :(<br>
<br>
So I wrote a PR to fix it: <a href=3D"https://github.com/php/php-src/pull/1=
4986" rel=3D"noreferrer noreferrer" target=3D"_blank">https://github.com/ph=
p/php-src/pull/14986</a><br>
<br>
What do you think? Does this need an RFC?<br>
<br>
Cheers,<br>
Bilge<br>
</blockquote></div>

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