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Date: Sat, 7 Nov 2020 18:41:22 -0500
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To: internals@lists.php.net
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Subject: [RFC] Support for <func>::function syntax
From: as@php.net

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Hello internals,

Looking for feedback on the idea of supporting `::function` syntax (or
`::fn`) for consistency with existing `::class` syntax:

    $arr = ['apple'];
    print_r(array_map(strtoupper::function, $arr));

(Apologies if this has already been discussed. Hard to search for
colon-colon-function.)

Benefits in my view are readability and potential use in static analysis.
Downsides (as implemented in proof-of-concept) are that it can be
needlessly littered in a lot of places, and that it breaks class consts
named `function`. I'd vote against it in its current state, but if people
like the general idea maybe the drawbacks can be addressed with a better
implementation.

Examples:
https://gist.github.com/adsr/2c0b9243986418af3cecf8046657304b

Proof-of-concept:
https://github.com/adsr/php-src/commit/07bb24243022ccef5823f6977d231f3535a48a07.patch

Adam

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