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Subject: Re: [PHP-DEV] [IDEA for RFC] class_uses and optionally returning
 traits for parent classes
Date: Wed, 25 Mar 2026 12:13:03 +0100
In-Reply-To: <CADjdLZKaEvRxOmK5zzT1K11y3DY0Oo+Rv60Xrf-3vUHJ93-n-g@mail.gmail.com>
Cc: internals@lists.php.net
To: Robert Humphries <contact@developer-rob.co.uk>
References: <CADjdLZKaEvRxOmK5zzT1K11y3DY0Oo+Rv60Xrf-3vUHJ93-n-g@mail.gmail.com>
From: claude.pache@gmail.com (Claude Pache)


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> Le 25 mars 2026 =C3=A0 08:37, Robert Humphries =
<contact@developer-rob.co.uk> a =C3=A9crit :
>=20
> it isn't documented why it only returns traits on the current class


The reason is given here: =
https://bugs.php.net/bug.php?id=3D61554#1333085728 :

Traits are outside the inheritance system: the=20
parent class is effectively defined by the composition of its own=20
methods/properties and any traits it uses, so trait usage is not =
actually=20
inherited. Furthermore, it doesn't really make sense to reflect trait =
usage down=20
the class hierarchy because the same trait may be used more than once =
within a=20
class hierarchy.


=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 25 mars 2026 =C3=A0 08:37, Robert Humphries =
&lt;contact@developer-rob.co.uk&gt; a =C3=A9crit :</div><br =
class=3D"Apple-interchange-newline"><div><span style=3D"caret-color: =
rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: =
normal; font-variant-caps: normal; font-weight: 400; letter-spacing: =
normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: 2; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none; float: none; =
display: inline !important;">it isn't documented why&nbsp;</span><span =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
14px; font-style: normal; font-variant-caps: normal; font-weight: 400; =
letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none; float: none; =
display: inline !important;">it only returns traits on the current =
class</span></div></blockquote></div><br><div><br></div><div>The reason =
is given here:&nbsp;<a =
href=3D"https://bugs.php.net/bug.php?id=3D61554#1333085728">https://bugs.p=
hp.net/bug.php?id=3D61554#1333085728</a>&nbsp;:</div><blockquote =
style=3D"margin: 0 0 0 40px; border: none; padding: =
0px;"><div><br></div><div>Traits are outside the inheritance system: =
the&nbsp;</div><div>parent class is effectively defined by the =
composition of its own&nbsp;</div><div>methods/properties and any traits =
it uses, so trait usage is not actually&nbsp;</div><div>inherited. =
Furthermore, it doesn't really make sense to reflect trait usage =
down&nbsp;</div><div>the class hierarchy because the same trait may be =
used more than once within a&nbsp;</div><div>class =
hierarchy.</div><div><br></div></blockquote><div></div><br><div>=E2=80=94C=
laude</div></body></html>=

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