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Date: Sat, 16 Nov 2024 00:39:55 +0100
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Subject: Re: [PHP-DEV] Optional interfaces
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From: rob@bottled.codes ("Rob Landers")

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On Sat, Nov 16, 2024, at 00:34, Juris Evertovskis wrote:
> Hey all,
> =20
> If you try to implement an interface that does not exist, you get the =
=E2=80=98Interface =E2=80=9C%s=E2=80=9D not found=E2=80=99 error. Usuall=
y that=E2=80=99s useful as it points to a code error.
> =20
> However, sometimes we want our code to be compatible with an optional =
library. For example, my Expression class might be compatible with some =
ORM, but it would also usable without it or with another ORM. This can a=
lready be accomplished, but the solutions seems very workaroundish: http=
s://stackoverflow.com/questions/57996429/implements-interface-only-if-ex=
ists
> =20
> Maybe the PHP itself should allow marking some interfaces as optional =
=E2=80=94 such that they are discarded from the list if the interface cl=
ass does not exist? Here=E2=80=99s one way the syntax could look like:
> =20
>     class Expression implements MyInterface, ?OptionalInterface {}
> =20
>     interface EventDispatcherInterface extends ?PsrEventDispatcherInte=
rface {}
> =20
> BR,
> Juris

Hey Juris,

Is there some reason you cannot do this:

https://3v4l.org/hF1vr

=E2=80=94 Rob
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<!DOCTYPE html><html><head><title></title><style type=3D"text/css">#qt p=
.qt-MsoNormal{margin-top:0cm;margin-right:0cm;margin-bottom:0cm;margin-l=
eft:0cm;font-size:11pt;font-family:Aptos, sans-serif;}=0A#qt a:link{colo=
r:rgb(70, 120, 134);text-decoration-line:underline;text-decoration-thick=
ness:initial;text-decoration-style:initial;text-decoration-color:initial=
;}=0A=0Ap.MsoNormal,p.MsoNoSpacing{margin:0}</style></head><body><div>On=
 Sat, Nov 16, 2024, at 00:34, Juris Evertovskis wrote:<br></div><blockqu=
ote type=3D"cite" id=3D"qt" style=3D"overflow-wrap:break-word;"><div cla=
ss=3D"qt-WordSection1"><p class=3D"qt-MsoNormal">Hey all,<br></p><p clas=
s=3D"qt-MsoNormal">&nbsp;<br></p><p class=3D"qt-MsoNormal">If you try to=
 implement an interface that does not exist, you get the =E2=80=98Interf=
ace =E2=80=9C%s=E2=80=9D not found=E2=80=99 error. Usually that=E2=80=99=
s useful as it points to a code error.<br></p><p class=3D"qt-MsoNormal">=
&nbsp;<br></p><p class=3D"qt-MsoNormal">However, sometimes we want our c=
ode to be compatible with an optional library. For example, my Expressio=
n class might be compatible with some ORM, but it would also usable with=
out it or with another ORM. This can already be accomplished, but the so=
lutions seems very workaroundish: <a href=3D"https://stackoverflow.com/q=
uestions/57996429/implements-interface-only-if-exists">https://stackover=
flow.com/questions/57996429/implements-interface-only-if-exists</a><br><=
/p><p class=3D"qt-MsoNormal">&nbsp;<br></p><p class=3D"qt-MsoNormal">May=
be the PHP itself should allow marking some interfaces as optional =E2=80=
=94 such that they are discarded from the list if the interface class do=
es not exist? Here=E2=80=99s one way the syntax could look like:<br></p>=
<p class=3D"qt-MsoNormal">&nbsp;<br></p><p class=3D"qt-MsoNormal">&nbsp;=
&nbsp;&nbsp; class Expression implements MyInterface, ?OptionalInterface=
 {}<br></p><p class=3D"qt-MsoNormal">&nbsp;<br></p><p class=3D"qt-MsoNor=
mal">&nbsp;&nbsp;&nbsp; interface EventDispatcherInterface extends ?PsrE=
ventDispatcherInterface {}<br></p><p class=3D"qt-MsoNormal">&nbsp;<br></=
p><p class=3D"qt-MsoNormal">BR,<br></p><p class=3D"qt-MsoNormal">Juris<b=
r></p></div></blockquote><div><br></div><div>Hey Juris,<br></div><div><b=
r></div><div>Is there some reason you cannot do this:<br></div><div><br>=
</div><div><a href=3D"https://3v4l.org/hF1vr">https://3v4l.org/hF1vr</a>=
<br></div><div><br></div><div id=3D"sig121229152">=E2=80=94 Rob<br></div=
></body></html>
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