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Date: Thu, 27 Sep 2018 18:15:50 +0300
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Subject: HA: Re: [PHP-DEV] Re: Pre proposal for "Class extension functions"
From: AGromov@alfabank.ru (Andrey O Gromov)

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I think that it is good idea to write page on RFC wiki with detailed 
descriptions, examples and motivations. I see that it can't be accepted in 
nearest future, but let it be for history. :)

There is many open questions. I will try to resolve that I can.

>>> 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.
Yes, I understand it. At the beginning I'm trying to find way for Kotlin 
style realization - function with receiver. But, unfortunately, it seems 
almost impossible if keep it simple.

> where this is really syntactic sugar
Exactly. I'm positioning this as syntactic sugar. And very useful sugar I 
hope.

> In dynamic languages like JavaScript, you're literally writing to a
> map of methods, which means execution order is critical, and overwrites 
are possible
Need some advice. Why execution order is critical? 
Inserting into `ce->functions_list` maked at compile time, and overwtites 
will be checked at this time too.

> What's wrong with just calling a function and passing the object as 
argument?
Nothing but aesthetic sense.

For example, PDO.

Classic way:

$stmt = $db->prepare($sql);
$stmt->execute();
$oneValue = $stmt->fetch(PDO::FETCH_NUMERIC)[0]??$default;

Standart function way

function takeOne($db, $sql, $default){
    //see "classic way"
    return $value;
}

$oneValue = takeOne($db, $sql, $default);

This is looks not good for me. 
- 3 arguments
- no intuitive connection to $db
- "takeOne" placed in global functions scope for simple utility logic.

Proxy class method. Let me do not write monstrous wrapper over PDO?

Extension function style

function PDO->takeOne($sql, $default){
    //see "classic way"
    return $value;
}

$oneValue = $db->takeOne($sql, $default);

- Intuitive connection to $db.
- "takeOne" encapsulated inside PDO class
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