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Date: Wed, 26 Sep 2018 17:57:29 +0200
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To: andrewgrom@rambler.ru
Cc: PHP internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Re: Pre proposal for "Class extension functions"
From: rasmus@mindplay.dk (Rasmus Schultz)

On Mon, Sep 24, 2018 at 11:24 PM Andrew Gromov <andrewgrom@rambler.ru> wrote:

> > Bring a little Javascript into PHP?
>
> In fact, I looked at Kotlin :)

Kotlin does not modify classes.

This sort of thing is sound in compiled languages like Kotlin and C#, where
this is really syntactic sugar for calling user-defined functions with
object-like
syntax - it's possible (and sound) *only* because these languages can resolve
such calls at compile-time.

In dynamic languages like JavaScript, you're literally writing to a
map of methods,
which means execution order is critical, and overwrites are possible - just two
reasons why this feature isn't sound in languages like JavaScript, and wouldn't
be in PHP either.

What's wrong with just calling a function and passing the object as argument?

In my opinion, this is the kind of pointless feature that brings nothing new and
invites inconsistent code and bikeshedding over pointless details.