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Subject: =?utf-8?Q?Re=3A_=5BPHP-DEV=5D_=5BRFC=5D_array=5Fonly=28=29_and_ar?=
 =?utf-8?Q?ray=5Fexcept=28=29_=E2=80=93_Utility_functions_for_array_key_fi?=
 =?utf-8?Q?ltering?=
Date: Fri, 20 Feb 2026 11:08:38 +0100
In-Reply-To: <CAO3baw=Qe-w4UOQzc4_NO=b41N-DJtf8U9Q6HybMCcCtZoEqgA@mail.gmail.com>
Cc: internals@lists.php.net
To: Muhammed Arshid KV <arshidkv12@gmail.com>
References: <CAO3baw=Qe-w4UOQzc4_NO=b41N-DJtf8U9Q6HybMCcCtZoEqgA@mail.gmail.com>
From: claude.pache@gmail.com (Claude Pache)


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> Le 20 f=C3=A9vr. 2026 =C3=A0 10:25, Muhammed Arshid KV =
<arshidkv12@gmail.com> a =C3=A9crit :
>=20
> Hello Internals,
>=20
> I would like to propose a new RFC titled array_only() and =
array_except().
>=20
> RFC: https://wiki.php.net/rfc/array_only_except =
<https://wiki.php.net/rfc/array_only_except?utm_source=3Dchatgpt.com>
> This RFC proposes adding two utility functions to the PHP core:
>=20
> =E2=80=A2 array_only(array $array, array $keys): array
> =E2=80=A2 array_except(array $array, array $keys): array
>=20
> These functions allow selecting or excluding specific keys from an =
array.=20
>=20
> Similar helpers are commonly used in frameworks, and adding native =
support would improve readability and consistency in userland code.
>=20
> Summary:
>=20
> =E2=80=A2 array_only() returns a new array containing only the =
specified keys.
> =E2=80=A2 array_except() returns a new array excluding the specified =
keys.
> =E2=80=A2 Original array is not modified.
> =E2=80=A2 Works with associative and numeric keys.
> =E2=80=A2 No impact on SAPIs or on OPcache.
>=20
> I would appreciate feedback and suggestions from the community.
> If there is general agreement, I plan to move the RFC forward.
>=20
> Thanks,
> Muhammed Arshid KV
>=20

Hi,

The principle of the RFC is interesting to me, as it is a situation I =
encounter from time to time. Two remarks:

1. It may be interesting to compare with currently available solutions. =
Currently, I use  `array_intersect_key` and `array_diff_key` when I need =
the semantics of proposed `array_only` and `array_except`:

```php
array_intersect_key($data, ['id' =3D> null, 'email' =3D> null]);
```

2. I think that the name of the new functions ought to make evident that =
we are filtering on keys and not on something else. I suggest: =
`array_only_keys` and `array_except_keys`.

=E2=80=94Claude


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<html aria-label=3D"message body"><head><meta http-equiv=3D"content-type" =
content=3D"text/html; charset=3Dutf-8"></head><body =
style=3D"overflow-wrap: break-word; -webkit-nbsp-mode: space; =
line-break: after-white-space;"><br =
id=3D"lineBreakAtBeginningOfMessage"><div><br><blockquote =
type=3D"cite"><div>Le 20 f=C3=A9vr. 2026 =C3=A0 10:25, Muhammed Arshid =
KV &lt;arshidkv12@gmail.com&gt; a =C3=A9crit :</div><br =
class=3D"Apple-interchange-newline"><div><div dir=3D"ltr"><p>Hello =
Internals,</p><p>I would like to propose a new RFC titled =
<strong>array_only() and array_except()</strong>.</p><p>RFC: <a =
rel=3D"noopener" class=3D"gmail-decorated-link" =
href=3D"https://wiki.php.net/rfc/array_only_except?utm_source=3Dchatgpt.co=
m">https://wiki.php.net/rfc/array_only_except<span aria-hidden=3D"true" =
class=3D"gmail-ms-0.5 gmail-inline-block gmail-align-middle =
gmail-leading-none"></span></a></p><p>This RFC proposes adding two =
utility functions to the PHP core:</p><p>=E2=80=A2 array_only(array =
$array, array $keys): array<br>
=E2=80=A2 array_except(array $array, array $keys): array</p><p>These =
functions allow selecting or excluding specific keys from an =
array.&nbsp;</p><p>Similar helpers are commonly used in frameworks, and =
adding native support would improve readability and consistency in =
userland code.</p><p>Summary:</p><p>=E2=80=A2 array_only() returns a new =
array containing only the specified keys.<br>
=E2=80=A2 array_except() returns a new array excluding the specified =
keys.<br>
=E2=80=A2 Original array is not modified.<br>
=E2=80=A2 Works with associative and numeric keys.<br>
=E2=80=A2 No impact on SAPIs or on <span =
class=3D"gmail-hover:entity-accent entity-underline gmail-inline =
gmail-cursor-pointer gmail-align-baseline"><span =
class=3D"gmail-whitespace-normal">OPcache</span></span>.</p><p>I would =
appreciate feedback and suggestions from the community.<br>
If there is general agreement, I plan to move the RFC =
forward.</p><p>Thanks,<br>
Muhammed Arshid KV</p></div>
</div></blockquote><br></div><div>Hi,</div><div><br></div><div>The =
principle of the RFC is interesting to me, as it is a situation I =
encounter from time to time. Two remarks:</div><div><br></div><div>1. It =
may be interesting to compare with currently available solutions. =
Currently, I use &nbsp;`array_intersect_key` and `array_diff_key` when I =
need the semantics of proposed `array_only` and =
`array_except`:</div><div><br></div><div>```php</div><div>array_intersect_=
key($data, ['id' =3D&gt; null, 'email' =3D&gt; =
null]);</div><div>```</div><div><br></div><div>2. I think that the name =
of the new functions ought to make evident that we are filtering on keys =
and not on something else. I suggest: `array_only_keys` and =
`array_except_keys`.</div><div><br></div><div>=E2=80=94Claude</div><div><b=
r></div></body></html>=

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