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Date: Mon, 21 Mar 2022 11:27:56 +0100
Message-ID: <CAPzBOBOYKOrfHnHOLrpAG09jmd5hmMd+FYxpXdOwzGkGUkAvzA@mail.gmail.com>
To: Rowan Tommins <rowan.collins@gmail.com>
Cc: internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary="000000000000cd455005dab7f38d"
Subject: Re: [PHP-DEV] [RFC][Under discussion] Arbitrary string interpolation
From: landers.robert@gmail.com (Robert Landers)

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On Mon, Mar 21, 2022 at 10:51 AM Rowan Tommins <rowan.collins@gmail.com>
wrote:

> On 20/03/2022 13:39, Rowan Tommins wrote:
> > Using a second colon would make ternary expressions slightly awkward;
> > C# handles this by requiring them to be parenthesised, so "{$:( $test
> > ? $x : $y )}" would be valid but "{$:$test ? $x : $y}" would not; we
> > could use some other delimiter, but they'd probably all need something
> > similar.
>
>
> Thinking about it, a second colon might also cause problems for
> expressions like "{$: Foo::bar() }", so since we have multiple symbols
> at the start anyway, how about a prefixed formatting argument, e.g.
> "{$%10.3f: $x }"
>
> Regards,
>
> --
> Rowan Tommins
> [IMSoP]
>
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> PHP Internals - PHP Runtime Development Mailing List
> To unsubscribe, visit: https://www.php.net/unsub.php
>
>
The downside of a prefix is that it isn't backwards compatible. You could
use # in a suffix so if you need to write backwards compatible code, you
can. So maybe:

echo "{$x#10.3f}";

which can be written like this in backwards compatible code:

echo "{$x#10.3f
}";

It isn't pretty, but it's better than a parse error and things like Rector
could do this automatically.

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