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Date: Thu, 19 Feb 2015 16:16:22 +0400
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To: Rasmus Lerdorf <rasmus@lerdorf.com>, "internals@lists.php.net" <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Digit separators for numeric literals
From: inefedor@gmail.com (Nikita Nefedov)

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2015-02-19 6:44 GMT+04:00 Rasmus Lerdorf <rasmus@lerdorf.com>:
>
> I think it will be difficult to find a separator character that doesn't
> make a mess of the grammar.
>
>   my_func(1,999,999) obviously doesn't work
>   my_func(1'999'999) as per C++14 clashes with our single-quoted strings
>   my_func(1_999_999) like in ADA might work
>
> but _999_ would need to work as well and _ is a valid char in a constant
> so you can have a constant named _999_.
>
>   - nope
>   # nope
>   @ nope
>   ~ nope
>   ! nope
>   % nope
>   ^ nope
>
> We went through this for the namespace char, and there simply isn't a
> typable single character left to use for something like this. _ is the
> closest but it would require some changes and BC breaks which I am not
> sure is worth for what appears to me to be a not-so critical feature.
>
> Now if we went into Unicode territory, we could do it. eg.
>
>   my_func(1 999 999) U+1680 (although it looks too much like a -)
>   my_func(1 999 999) U+205F (mathematical space)
>   my_func(1=D9=AC999=D9=AC999) U+066C (Arabic thousands separator)
>   my_func(1=C2=B7999=C2=B7999) U+00B7 (middle dot)
>
> The last one looks best to me, but we'd need a team of people working in
> shifts to answer the, "How do I type this?" question.
>
> -Rasmus
>
>

Hey,

Why not space? It's certainly possible (I just checked) and it would look
clear I guess:

    my_func(1 999 999);

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