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Date: Sat, 14 May 2016 12:33:47 +0200
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Subject: Re: [PHP-DEV] [RFC] Pipe Operator
From: francois@php.net (=?UTF-8?Q?Fran=c3=a7ois_Laupretre?=)

Le 14/05/2016 à 01:36, Simon Welsh a écrit :
> I’m not fond of this approach. Take in_array as an example. I have,
> in the same file, piped an array in as the second argument and
> piped a string in as the first. To have the position of the piped
> variable be implicit, you’ll need multiple versions of in_array.
>
> Sure, you could try to use the type of the value being passed in,
> but that ends up much more magic and then you run into the same
> problem with strpos, or password_verify, or a variety of other
> functions that take multiple of the same type of argument where
> order matters.

Right. Some functions may have several potential arguments to 
substitute. In this case, I propose we choose a position to use when the 
function is used in a pipe and, then, create function aliases with 
different positions.

Example :

Imagine we decide that in_array() substitutes the $needle arg :

$string |> in_array($haystack)

Then, we create a function alias, named 'array_contains()', whose only 
difference with in_array() is that it substitutes the $haystack argument :

$haystack |> array_contains($needle)

This way, we can create 2 or 3 ways to call the same function with 
different arguments to substitute.

Regards

François