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Date: Mon, 02 Jun 2025 21:25:18 -0500
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Subject: Re: [PHP-DEV] [RFC] Pipe Operator (again)
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From: larry@garfieldtech.com ("Larry Garfield")

On Mon, Jun 2, 2025, at 3:41 PM, Dmitry Derepko wrote:
> Hi Larry!
>
>
>
> It's been a long, long way to get this feature, awesome work.
>
>
>
> Have you considered adding a compose function that does the same thing=20
> but in the classic PHP function style?
>
>
>
> There's not much difference between the new style:
>
>
>
>
>
> $processor =3D fn ($data) =3D> htmlentities($data)
>
>     |> str_split(...),
>
>         |> fn($x) =3D> array_map(strtoupper(...), $x),
>
>         |> fn($x) =3D> array_filter($x, fn($v) =3D> $v !=3D 'O=E2=80=99=
);
>
>
>
> and the old one:
>
>
>
> $processor =3D compose(
>
>     htmlentities(...),
>
>     str_split(...),
>
>     fn ($x) =3D> array_map(strtoupper(...), $x),
>
>     fn ($x) =3D> array_filter($x, fn ($v) =3D> $v !=3D 'O'),
>
> );
>
>
>
> But the classic looks better when you create real pipes.=20
>
>
>
> I=E2=80=99ve created examples with comparison.
>
>
>
> https://3v4l.org/jY0Vg
>
> https://3v4l.org/87Sj2
>
> https://3v4l.org/4EE6b
>
>
>
>
>
> New syntax just makes code shorter, but the compose function still hav=
e=20
> benefits:
>
> - it will be able to add a polyfill for older versions
>
> - it will be possible to write the first function without passing the=20
> first argument ($data in the "fn ($data) =3D> htmlentities($data)=E2=80=
=9D)
>
> - it will be possible to re-use the compose function along with the ne=
w=20
> operator $data |> compose(=E2=80=A6$functions)

Pipe and compose are importantly different operations.  I've had user-sp=
ace implementations of both available for years in crell/fp:  https://gi=
thub.com/Crell/fp/blob/master/src/composition.php

I'd love to have a compose operator natively in PHP, too.  The RFC for t=
hat is already written, just needs code.  I hope to formally propose it =
soon:  https://wiki.php.net/rfc/function-composition

--Larry Garfield