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Date: Thu, 30 Apr 2020 13:14:52 +0200
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To: Ryan Jentzsch <ryan.jentzsch@gmail.com>
Cc: Internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Ternary operator associativity
From: nikita.ppv@gmail.com (Nikita Popov)

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On Thu, Apr 30, 2020 at 1:12 PM Ryan Jentzsch <ryan.jentzsch@gmail.com>
wrote:

> Is there a possibility this can be fixed in version 8? From
> http://phpsadness.com/sad/30 listed as an outright bug (I don't have
> the C skills to fix this. I am just raising this as an issue that has
> been a criticism of PHP for many years now with a new major version
> upcoming that could allow for a b/c of this significance to improve
> the language):
>
> The ternary operator is left-associative and therefore behaves
> entirely incorrectly:
>
> $ cat ternary.php
> <?php
> echo (FALSE ? "a" : FALSE ? "b" : "c")."\n";
> echo (FALSE ? "a" : TRUE ? "b" : "c")."\n";
> echo (TRUE ? "a" : FALSE ? "b" : "c")."\n";
> echo (TRUE ? "a" : TRUE ? "b" : "c")."\n";
> ?>
>
> $ php ternary.php
> c
> b
> b
> b
>
> In any other language with a ternary operator, you can stack them and
> build an if-elseif-elseif-else expression:
>
> $ cat ternary.pl
> #!/usr/bin/perl -w
> use strict;
>
> print +(0 ? "a" : 0 ? "b" : "c")."\n";
> print +(0 ? "a" : 1 ? "b" : "c")."\n";
> print +(1 ? "a" : 0 ? "b" : "c")."\n";
> print +(1 ? "a" : 1 ? "b" : "c")."\n";
>
> $ perl ternary.pl
> c
> b
> a
> a
>

Please see https://wiki.php.net/rfc/ternary_associativity.

Regards,
Nikita

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