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Date: Sat, 02 Aug 2025 22:59:20 +0200
To: "Rowan Tommins [IMSoP]" <imsop.php@rwec.co.uk>, internals@lists.php.net
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Subject: Re: [PHP-DEV] Protected inheritance hierarchies
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From: rob@bottled.codes ("Rob Landers")

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On Sat, Aug 2, 2025, at 22:33, Rowan Tommins [IMSoP] wrote:
> On 2 August 2025 20:12:59 BST, Rob Landers <rob@bottled.codes> wrote:
> >I mentioned in my first reply, there is no way to get an instance-lev=
el property unshadowed. It is there though (according to inheritance.c, =
if I=E2=80=99m reading it right, it is still accessible, just not from u=
ser-land).
>=20
>=20
> I'd be interested to see what code you're looking at. As I showed in m=
y last email, there's an explicit difference in how private and protecte=
d property names are mangled, and it's consistent with how reflection, s=
erialisation, and debug functions output them - which is that there is o=
nly one property, no matter how many times in the inheritance chain it i=
s redefined.
>=20
>=20
> Rowan Tommins
> [IMSoP]
>=20

If this were the case, then creating a base class with default values wo=
uldn=E2=80=99t be possible. The memory exists and is set aside for that.=
 The child class shadows this value, but the original value still exists=
. You can get to it by calling into the parent class entry and accessing=
 it that way. There is no way to get to that value from an instance in p=
hp, though =E2=80=94 from the perspective of the child, shadowing loses =
the original default value.

=E2=80=94 Rob
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<!DOCTYPE html><html><head><title></title></head><body><div>On Sat, Aug =
2, 2025, at 22:33, Rowan Tommins [IMSoP] wrote:</div><blockquote type=3D=
"cite" id=3D"qt" style=3D""><div>On 2 August 2025 20:12:59 BST, Rob Land=
ers &lt;<a href=3D"mailto:rob@bottled.codes">rob@bottled.codes</a>&gt; w=
rote:</div><div>&gt;I mentioned in my first reply, there is no way to ge=
t an instance-level property unshadowed. It is there though (according t=
o inheritance.c, if I=E2=80=99m reading it right, it is still accessible=
, just not from user-land).</div><div><br></div><div><br></div><div>I'd =
be interested to see what code you're looking at. As I showed in my last=
 email, there's an explicit difference in how private and protected prop=
erty names are mangled, and it's consistent with how reflection, seriali=
sation, and debug functions output them - which is that there is only on=
e property, no matter how many times in the inheritance chain it is rede=
fined.</div><div><br></div><div><br></div><div>Rowan Tommins</div><div>[=
IMSoP]</div><div><br></div></blockquote><div><br></div><div>If this were=
 the case, then creating a base class with default values wouldn=E2=80=99=
t be possible. The memory exists and is set aside for that. The child cl=
ass shadows this value, but the original value still exists. You can get=
 to it by calling into the parent class entry and accessing it that way.=
 There is no way to get to that value from an instance in php, though =E2=
=80=94 from the perspective of the child, shadowing loses the original d=
efault value.</div><div><br></div><div id=3D"sig121229152">=E2=80=94 Rob=
</div></body></html>
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