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Date: Fri, 20 Jul 2012 13:03:32 +0400
Cc: internals internals <internals@lists.php.net>
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To: Stas Malyshev <smalyshev@sugarcrm.com>
Subject: Re: [PHP-DEV] Regarding PHP6, string/array APIs
From: indeyets@gmail.com (Alexey Zakhlestin)

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On 20.07.2012, at 4:09, Stas Malyshev wrote:

> Hi!
>=20
>> 2. It would be really useful to have 2 versions of each function: one
>> which mutates the variable and one which returns the new variable.
>>=20
>> Example:
>>=20
>> <?php $src =3D 'SoUrCe'; $result =3D lowered($src); // $result =3D=3D
>> 'source', $src =3D=3D 'SoUrCe' $result =3D lower($srd);   // $result =
=3D=3D
>> true,     $src =3D 'source' ?>
>>=20
>=20
> I'm not sure I understand why. What's wrong with $src =3D =
lowered($src);?

That's just convenience. matter of readability.

lower() can be implemented in userland and if we had "standard" userland =
library that would be a good place for it :)

function lower(&$str)
{
    $str =3D lowered($str);
}

> Also, when lower() returns not true? If there's a legitimate situation
> when it must return not true (I can't think of any, but maybe for more
> complex functions there is) what lowered() is supposed to do in the =
same
> situation? If there's none, why bother returning true?

As you said, it might be needed in more complex functions and it makes =
sense to return true just for consistency.
Other option is to (implicitly) return null and use exceptions.
And I, personally, would prefer exceptions ;)

>> 3. Speaking of implementation=85 Functions, which return slice of
>> string/array could be made to reference the same memory-areas as the
>> source strings/arrays. That is until the first modification, of
>> course. Kinda advanced copy-on-write semantics. I know something like
>> that is implemented in D http://dlang.org/d-array-article.html and
>> Go
>=20
> Strings are not modified in PHP (IS_STRING zvals can be modified but =
the
> actual string buffers aren't) so there's no actual "write" and thus no
> copy needed. But having this would require separate refcounting on
> string values, which may be a bit complicated to do.

much worse than that. refcounting on string-slices!

>> 4. casting between strings and arrays of characters would be a great
>> thing to have too. this way, useful array-oriented functions could be
>> applied to strings
>=20
> We already have it, it's str_split().

I know. But that is not "casting". I can not pass string to the function =
which expects array (thinking about array_map, array_filter, =85). I =
have to call str_split explicitly.


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