Edit report at https://bugs.php.net/bug.php?id=62537&edit=1
ID: 62537
Comment by: metamarkers at gmail dot com
Reported by: jeremeamia at gmail dot com
Summary: Composed class has fatal error with duplicate, equal
array properties
Status: Open
Type: Bug
Package: Class/Object related
Operating System: Ubuntu
PHP Version: 5.4.4
Block user comment: N
Private report: N
New Comment:
This is a bug. It should not a be a fatal error if the initial value is even the
same **type**. Consider using traits to define default static vars. Defining them
through inheritance, these static vars are clobbered unless explicitly redefined
in every child class.
It makes perfect sense not to allow this with constants, but why static
variables?
Previous Comments:
------------------------------------------------------------------------
[2012-10-26 19:09:49] dagguh at gmail dot com
If it is logically the same thing, it should be only in one of these traits, don't
you think?
SRP and DRY, fellas
------------------------------------------------------------------------
[2012-07-20 09:07:13] aharvey@php.net
I'd call this a bug, rather than a documentation issue; if Foo::$var === Bar::$var, I
can't really see why it should fatal.
Reclassifying, and we'll see what the engine folk think.
------------------------------------------------------------------------
[2012-07-12 01:36:55] jeremeamia at gmail dot com
Another test script, which might be even more relevant:
trait Foo {public $var = [];}
class Bar {use Foo; public $var = [];}
This also causes a fatal error for me, which should only be a strict error based
on the documentation.
------------------------------------------------------------------------
[2012-07-11 19:45:00] jeremeamia at gmail dot com
Description:
------------
---
From manual page: http://www.php.net/language.oop5.traits
---
The manual says, "If a trait defines a property then a class can not define a
property with the same name, otherwise an error is issued. It is an E_STRICT if
the class definition is compatible (same visibility and initial value) or fatal
error otherwise."
This does not appear to be true when the same-named properties have array values.
See the test script for a quick example. It seems that it behaves as the
documentation describes only with scalar values.
This is either missing/erroneous documentation (i.e. the behavior is intended), or
it is a bug (i.e. equal array values should not cause a fatal error).
Test script:
---------------
trait Foo {public $var = [];}
trait Bar {public $var = [];}
class Baz {use Foo, Bar;}
Expected result:
----------------
To behave as the documentation describes, i.e. no fatal errors occuring.
Actual result:
--------------
PHP Fatal error: Foo and Bar define the same property ($var) in the composition
of Baz. However, the definition differs and is considered incompatible.
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=62537&edit=1