Re: [RFC] Partial Function Application v2

From: Date: Mon, 17 Nov 2025 16:26:53 +0000
Subject: Re: [RFC] Partial Function Application v2
References: 1 2  Groups: php.internals 
Request: Send a blank email to internals+get-129282@lists.php.net to get a copy of this message 
Hey Larry,

On 16.11.2025 21:51:59, Larry Garfield wrote:

On Sat, Jun 28, 2025, at 12:06 AM, Larry Garfield wrote:

Hi folks.  Arnaud and I would like to present take-2 at Partial
Function Application.

https://wiki.php.net/rfc/partial_function_application_v2

It is largely similar to the previous PFA proposal from 2021, though
there are a number of changes.  Most notably:

* The implementation is simpler, because FCC already did part of the
work.  This RFC can build on it.
* Constructors are not supported.
* But optional arguments and named placeholders are supported.
* It includes pipe-based optimizations.

Note: We realize that this is a non-trivial RFC coming late in the
cycle.  We are proposing it now because, well, it's ready now.  If the
discussion goes smoothly, we're OK calling a vote on it for 8.5,
especially as it would complement pipes so well.  If the discussion
runs longer, we're also OK with targeting 8.6 instead.  We'll see how
that goes.

<floor opens for discussion, Larry falls through the trap door>

It's been just over 2 weeks since the last comment in the thread, and the last change was made (allowing for parameter reordering).  Please consider this the Intent to Vote post; I'll be calling the vote sometime probably late Tuesday or on Wednesday, baring any new issues before then.

--Larry Garfield


I've just gave the RFC another deep read, and found only mentions of pass-by-ref. But not return-by-ref, and neither does the implementation handle this case:

# ./sapi/cli/php -r 'function &r(&$a) { return $a; } $a = 1; $b = &r($a); ++$b; var_dump($a);'
int(2)
# ./sapi/cli/php -r 'function &r(&$a) { return $a; } $a = 1; $b = &r(?)($a); ++$b; var_dump($a);'

Notice: Only variables should be assigned by reference in Command line code on line 1
int(1)

Was this an oversight or intentionally omitted in the RFC? If it was, I'd like to hear the reasoning on this.


Thank you,

Bob

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