Re: [PHP-DEV] [RFC] Partial Function Application v2

[Tim Düsterhus]

Hi

Am 2025-06-28 07:06, schrieb Larry Garfield:
Hi folks.  Arnaud and I would like to present take-2 at Partial 
Function Application.

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

I've now had a *quick* look at the implementation and the following 
questions came up that the RFC does not answer (and the tests in the PR 
do not obviously answer either):

How will PFA calls appear in a stack trace and how will PFA Closures 
look like to `var_dump()`, Reflection, and to observers?

Classic FCC are 100% identical to the underlying function and thus can 
just “pretend” they are the underlying function, but that doesn't work 
for PFA. Consider the following:

    function foo(string $s, int $i) {
        var_dump($s, $i);
    }

    $f = foo("abc", ?);

    $f([]);

How will the error message for the resulting TypeError look like?

    var_dump($f); // same $f

How will the output look like?

    var_dump((new ReflectionFunction($f))->getName());
    var_dump((new ReflectionFunction($f))->getParameters());

Ditto

    is_callable($f, callable_name: $name);
    var_dump($name);

Ditto

    function foo(string $s, #[\SensitiveParameter] int $i) {
        throw new \Exception();
    }

    $f = foo("abc", ?);

    $f(123);

How will the stack trace look like? Does `#[\SensitiveParameter]` work 
properly?

Best regards
Tim Düsterhus