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Date: Mon, 19 Feb 2024 04:32:59 -0800
Message-ID: <CALfTnfWTTQih-uyc4uF-p2V8_GOkaRq127ts6pTFikgFd=3T+g@mail.gmail.com>
Subject: [PHP-DEV] ArrayAccess and array_key_exists function
To: PHP internals <internals@lists.php.net>
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From: ondrej@mirtes.cz (=?UTF-8?Q?Ond=C5=99ej_Mirtes?=)

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Hello everyone,
I was recently surprised that ArrayAccess does not work
with array_key_exists() function.

I am aware that ArrayAccess objects cannot be made to work with many array
functions because it does not provide a way to iterate over its keys, you
can only ask for and set specific previously known keys.

But it could be made to work with array_key_exists(), because it already
works with isset() and there=E2=80=99s a direct method that could be used f=
or this
- offsetExists().

The use case I have in mind is that sometimes libraries that originally use
=E2=80=9Carray=E2=80=9D in return types want to switch to objects and they =
make these
objects to implement ArrayAccess, for maximising the backward compatibility
with the old version. This mostly works, except for array_key_exists().

Do you think we could add support for ArrayAccess objects in the 2nd
parameter of array_key_exists() function?

Thank you.

Ond=C5=99ej Mirtes

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<html><body><div dir=3D"ltr">Hello everyone,<div dir=3D"ltr">I was recently=
 surprised that ArrayAccess does not work with=C2=A0array_key_exists() func=
tion.</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">I am aware that Arra=
yAccess objects cannot be made to work with many array functions because it=
 does not provide a way to iterate over its keys, you can only ask for and =
set specific previously known keys.</div><div dir=3D"ltr"><br></div><div di=
r=3D"ltr">But it could be made to work with=C2=A0array_key_exists(), becaus=
e it already works with isset() and there=E2=80=99s a direct method that co=
uld be used for this -=C2=A0offsetExists().</div><div dir=3D"ltr"><br></div=
><div dir=3D"ltr">The use case I have in mind is that sometimes libraries t=
hat originally use =E2=80=9Carray=E2=80=9D in return types want to switch t=
o objects and they make these objects to implement ArrayAccess, for maximis=
ing the backward compatibility with the old version. This mostly works, exc=
ept for array_key_exists().</div><div dir=3D"ltr"><br></div><div dir=3D"ltr=
">Do you think we could add support for ArrayAccess objects in the 2nd para=
meter of array_key_exists() function?</div><div dir=3D"ltr"><br></div><div =
dir=3D"ltr">Thank you.<br clear=3D"all"><div><div class=3D"gmail_signature"=
 data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr">=
<br></div><div dir=3D"ltr">Ond=C5=99ej Mirtes</div></div></div></div></div>=
</div></div></body></html>

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