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Date: Fri, 17 Oct 2025 10:24:04 +0200
To: Arnaud Le Blanc <arnaud.lb@gmail.com>
Cc: Larry Garfield <larry@garfieldtech.com>, php internals
 <internals@lists.php.net>
Subject: Re: [PHP-DEV] [RFC] Partial Function Application v2
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From: tim@bastelstu.be (=?UTF-8?Q?Tim_D=C3=BCsterhus?=)

Hi

Am 2025-10-13 19:00, schrieb Arnaud Le Blanc:
>> - How does it interact with
>> `ReflectionFunctionAbstract::getClosureUsedVariables()`?
>> - Same question for other scope introspection functionality (e.g. 
>> Xdebug).
> 
> getClosureUsedVariables() and other introspection functionality will
> report any used var as usual. Used vars are named after the parameter
> if there is no collision. But this should not be considered API as
> this may change. For instance, I want to optimize-out used vars for
> parameters that are pre-filled with a literal. It would be possible to
> hide used vars of a PFA in Reflection.

Understood, thank you for the clarification. Please add this information 
to the RFC (ideally with examples of the possible cases, e.g. the 
passing of the `Closure` object). It's fine if you explicitly say “we 
consider this an implementation detail, but this is how it currently 
works”. This is also useful information to have if a user reports a bug 
in PFA that relates to this, so that we can tell them “what you are 
doing is not guaranteed to work, please don't”.

Best regards
Tim Düsterhus