Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:106954
MIME-Version: 1.0
References: <CAF+90c9Kc6m_bv=aJxbD3-RmnNXXLqv6mPjHp7U7qxX_ck27qw@mail.gmail.com>
 <CAF+90c_KHYm1SLOKkZXM6xurYiDTX3=hbijpD8rT1OSUHSod_w@mail.gmail.com>
 <CEC35EF9-9956-44BE-8C8E-EE5FC3D5A7C7@gmail.com> <D5DDA318-E953-4AB8-873F-7CA7264722E2@koalephant.com>
 <E30D9A22-9842-4A67-ABA5-A339875FFE12@gmail.com> <CAG9XoMTG3OLbD0BfWv+ORUUsbMV2CaF0Ea4NLF1huHBr5JCmWQ@mail.gmail.com>
 <CALKiJKrftDt1ohJQLrgx+n57nf-TMVpUKYRVKWBkCa-ND1LVMg@mail.gmail.com>
 <CADyq6s+C07KABQcZ9x+vgH8pYdVcGZcx6m8Dg+E+LYn1RgOLoA@mail.gmail.com> <DED63BF6-96C5-475B-A263-C2E71961D8A6@gmail.com>
In-Reply-To: <DED63BF6-96C5-475B-A263-C2E71961D8A6@gmail.com>
Date: Thu, 12 Sep 2019 16:12:45 +0200
Message-ID: <CAG9XoMT=kctpoJBV4EzwCPvYrOKo6hSSNLe_EFk1w8KvftuTzw@mail.gmail.com>
To: Claude Pache <claude.pache@gmail.com>
Cc: Marco Pivetta <ocramius@gmail.com>, Rowan Tommins <rowan.collins@gmail.com>, 
	PHP internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary="000000000000fcf76505925bbb84"
Subject: Re: [PHP-DEV] [RFC] Reclassifying engine warnings
From: benjamin.morel@gmail.com (Benjamin Morel)

--000000000000fcf76505925bbb84
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

>> $foo[$key1][$key2] =3D ($foo[$key1][$key2] ?? 0) + 1;
> That violates blatantly DRY (twice the exact same lengthy expression
`$foo[$key1][$key2]`), so it is not a satisfactory solution.

$foo[$key1][$key2]??++ =F0=9F=98=83

More seriously, yes as Marco suggested, yes we can already do it, and as
Claude pointed out, yes that's verbose.

What I had in mind with language support is some kind of code-level (per
line or block) switch that would allow uninitialized array keys to behave
in a certain way, *depending on the context* : we actually have not one,
but two good examples of this above, provided that $key1 and $key2 do not
exist:

- with [], an unitialized key would be initialized with an empty array
(already does that)
- with ++, an unitialized key would be initialized with 0

Without the proper code-level switch, we could safely have both cases above
throw an exception.

=E2=80=94 Benjamin

--000000000000fcf76505925bbb84--