Edit report at https://bugs.php.net/bug.php?id=61943&edit=1
ID: 61943
Comment by: franssen dot roland at gmail dot com
Reported by: franssen dot roland at gmail dot com
Summary: Trait same property conflict in class extending
Status: Assigned
Type: Feature/Change Request
Package: Scripting Engine problem
Operating System: Ubuntu
PHP Version: 5.4.2
Assigned To: gron
Block user comment: N
Private report: N
New Comment:
We can agree there's only 1 property definition right?
The concrete classes Foo and Bar will never define that property since that
would be a "real" conflict.
So if you know that Bar::$prop is initially resolved from A::$prop as well as
B::$prop you could say it's the same definition...
Why i want this? I want to extend a package in a subpackage on class level as
well as trait level. The concrete subpackage classes extend the corresponding
package classes and i don't want to override the package trait functions in
each subpackage concrete class so the subpackage comes with its own trait,
build upon the package trait.
It's really an architecture thing..
<?php
namespace Base {
trait MainTrait { public $prop; }
class Main { use MainTrait; }
}
namespace Base\Sub {
trait MainTrait { use \Base\MainTrait; }
class Main extends \Base\Main { use MainTrait; }
}
Previous Comments:
------------------------------------------------------------------------
[2012-05-04 23:28:50] g...@php.net
Hi:
>From my point of view, it is not the same property.
My understanding is that you are moving here very much in the area of the
typical diamond problem of
multiple inheritance.
Theoretically, it is not clear whether the two properties should be handled as
the same or not.
Why would you want to apply the trait a second time?
Best regards
Stefan
------------------------------------------------------------------------
[2012-05-04 20:07:42] franssen dot roland at gmail dot com
Description:
------------
Hi,
(version is actually 5.4RC9...)
The same property conflict happens when you have 2 traits (B uses A) where A
defines the property, class Foo uses A and class Bar uses B _and_ extends Foo.
I would love to see the strict standard to be removed in this situation; how
can a property have a conflict with itself?
Test script:
---------------
<?php
trait A {
public $prop;
}
trait B {
use A;
}
class Foo {
use A;
}
class Bar extends Foo {
use B;
}
Expected result:
----------------
<void>
Actual result:
--------------
Strict Standards: Foo and B define the same property ($prop) in the composition
of Bar. This might be incompatible, to improve maintainability consider using
accessor methods in traits instead.
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=61943&edit=1
