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To: Chase Peeler <chasepeeler@gmail.com>
CC: Ilija Tovilo <tovilo.ilija@gmail.com>, PHP internals
	<internals@lists.php.net>
Thread-Topic: [PHP-DEV] [RFC][Under discussion] Arbitrary string interpolation
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Date: Fri, 18 Mar 2022 22:01:18 +0000
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Subject: Re: [PHP-DEV] [RFC][Under discussion] Arbitrary string interpolation
From: theodorejb@outlook.com (Theodore Brown)

On Fri, Mar 18, 2022 at 09:02 Chase Peeler <chasepeeler@gmail.com> wrote:=
=0A=
> On Fri, Mar 18, 2022 at 12:49 AM Theodore Brown <theodorejb@outlook.com> =
wrote:=0A=
> > =0A=
> > Personally I'm really looking forward to having this functionality.=0A=
> > Just a couple days ago I wanted to call a function in an interpolated=
=0A=
> > string, and it was really annoying to have to wrap the function in a=0A=
> > closure in order to use it.=0A=
> > =0A=
> > If this RFC is accepted I'd be able to replace code like this:=0A=
> > =0A=
> >     $name =3D "Theodore Brown";=0A=
> >     $strlen =3D fn(string $string): int =3D> strlen($string);=0A=
> >     echo "{$name} has a length of {$strlen($name)}.";=0A=
> > =0A=
> > with=0A=
> > =0A=
> >     $name =3D "Theodore Brown";=0A=
> >     echo "{$name} has a length of {$:strlen($name)}.";=0A=
> =0A=
> =0A=
> Out of curiosity, why not:=0A=
>=0A=
>     $name =3D "Theodore Brown";=0A=
>     echo "{$name} has a length of ".strlen($name).".";=0A=
> =0A=
> or even=0A=
>=0A=
>     $name =3D "Theodore Brown";=0A=
>     $len =3D strlen($name);=0A=
>     echo "{$name} has a length of {$len}.";=0A=
=0A=
Concatenation works fine for a simple example like this, but it can=0A=
get a lot messier when there are more than a few embedded variables.=0A=
It's particularly an issue with heredoc strings which are far more=0A=
cumbersome to concatenate.=0A=
=0A=
Yes, it's possible to add extra variables before the string like in=0A=
your second example, but this feels like unnecessary work, especially=0A=
when you already have all the variables you want and just want to=0A=
apply a function to them at several places in a template string.=0A=
=0A=
Theodore=