Newsgroups: php.internals
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Xref: news.php.net php.internals:126973
Date: Sat, 29 Mar 2025 15:46:16 +0100
To: internals@lists.php.net
Subject: Re: [PHP-DEV] [RFC] Pipe Operator (again)
In-Reply-To: <CAPyj-LBvmUfhakS+Z9wDYQ-J7Bypk9bbTupPqv-kvfPp8r_qnA@mail.gmail.com>
References: <de8140ab-0941-45cd-ba20-4aece2f69aea@app.fastmail.com> <CAPyj-LBvmUfhakS+Z9wDYQ-J7Bypk9bbTupPqv-kvfPp8r_qnA@mail.gmail.com>
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From: ojschmidt@kde.org (=?ISO-8859-1?Q?Olaf_Schmidt-Wischh=F6fer?=)

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Hi Ilija and Larry,

thank you so much for your great work bringing PHP forward=2E I have been =
passively reading this list for a while and would like to chime in with two=
 thoughts=2E

> Pipes would no longer have the form of expr |> expr, where the right-han=
d-side is expected to return a callable=2E Instead, it would have the form =
of expr |> function_call, where the left-hand-side is implicitly inserted a=
s the first parameter of the call=2E
>
>namespace Iter {
>    function map(iterable $iterable, \Closure $callback): \Iterator;
>    function filter(iterable $iterable, \Closure $callback): \Iterator;
>}
>
>namespace {
>    use function Iter\{map, filter};
>
>    $result =3D "Hello World"
>        |> str_split()
>        |> map(strtoupper(=2E=2E=2E))
>        |> filter(fn($v) =3D> $v !=3D 'O');
>}

With named parameters, you could even make this approach work without the =
suggested (but still useful) new Iterator API:

$result =3D "Hello World"
       |> str_split()
       |> array_map(callback: strtoupper(=2E=2E=2E))
       |> array_filter(callback: fn($v) =3D> $v !=3D 'O');

or

$result =3D "Hello World"
       |> str_split()
       |> array_map(callback: strtoupper(=2E=2E=2E))
       |> array_filter(fn($v) =3D> $v !=3D 'O');

I am also wondering whether |> and -> should have the same operator preced=
ence=2E

Best regards,

Olaf Schmidt-Wischh=C3=B6fer

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<!DOCTYPE html><html><body><div dir=3D"auto">Hi Ilija and Larry,<br><br>tha=
nk you so much for your great work bringing PHP forward=2E I have been pass=
ively reading this list for a while and would like to chime in with two tho=
ughts=2E<br><br>&gt; Pipes would no longer have the form of expr |&gt; expr=
, where the right-hand-side is expected to return a callable=2E Instead, it=
 would have the form of expr |&gt; function_call, where the left-hand-side =
is implicitly inserted as the first parameter of the call=2E<br>&gt;<br>&gt=
;namespace Iter {<br>&gt;=C2=A0=C2=A0=C2=A0 function map(iterable $iterable=
, \Closure $callback): \Iterator;<br>&gt;=C2=A0=C2=A0=C2=A0 function filter=
(iterable $iterable, \Closure $callback): \Iterator;<br>&gt;}<br>&gt;<br>&g=
t;namespace {<br>&gt;=C2=A0=C2=A0=C2=A0 use function Iter\{map, filter};<br=
>&gt;<br>&gt;=C2=A0=C2=A0=C2=A0 $result =3D "Hello World"<br>&gt;=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |&gt; str_split()<br>&gt;=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 |&gt; map(strtoupper(=2E=2E=2E))<br>&gt;=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |&gt; filter(fn($v) =3D&gt; $v !=3D 'O=
');<br>&gt;}<br><br>With named parameters, you could even make this approac=
h work without the suggested (but still useful) new Iterator API:<br><br>$r=
esult =3D "Hello World"<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |&gt; str_s=
plit()<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |&gt; array_map(callback: st=
rtoupper(=2E=2E=2E))<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |&gt; array_fi=
lter(callback: fn($v) =3D&gt; $v !=3D 'O');<br><br>or<br><br>$result =3D "H=
ello World"<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |&gt; str_split()<br>=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |&gt; array_map(callback: strtoupper(=
=2E=2E=2E))<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |&gt; array_filter(fn($=
v) =3D&gt; $v !=3D 'O');<br><br>I am also wondering whether |&gt; and -&gt;=
 should have the same operator precedence=2E<br><br>Best regards,<br><br>Ol=
af Schmidt-Wischh=C3=B6fer<br></div></body></html>
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