Edit report at https://bugs.php.net/bug.php?id=61147&edit=1
ID: 61147
Updated by: g...@php.net
Reported by: greywire at gmail dot com
Summary: No conflict resolution for properties in traits
-Status: Open
+Status: Suspended
Type: Feature/Change Request
Package: Class/Object related
Operating System: MacOS X 10.7
PHP Version: 5.4.0RC8
Block user comment: N
Private report: N
New Comment:
Unfortunately, the solution is not easy at all.
One reason is the dynamic nature of PHP. You can easily access properties based
on their string name:
$foo = 'bar';
$this->$foo = 'foobar';
For exactly the same reason, we do NOT provide 'renaming'. The conflict
resolution for methods allows to introduce an alias.
Nothing more. An alias is a new name pointing to an unchanged method-body.
(If you think about what that means, note that it breaks recursion in typical
cases.)
Thus, your proposal does not work with the current semantics. It would only
result in a new property in the class that is never actually used.
So far, we refrained from adding any of the constructs proposed in literature,
since they would add considerable complexity.
>From time to time there have been proposals for related features that could
>make
it into a future version of PHP, but for the moment being, I do not see how we
can make this work without changing the nature of PHP.
Suggestions are welcome of course.
Thanks
Stefan
Previous Comments:
------------------------------------------------------------------------
[2012-02-20 18:59:00] greywire at gmail dot com
Description:
------------
There is no way to resolve a conflict in two used traits with the same
property. The resolution method used to resolve conflicting method names
should be able to be used similarly on properties.
I realize this may be the intended behavior to discourage use of properties in
traits as properties were not originally intended in traits, but since
properties are allowed, there should be a way to resolve the conflict, and the
solution is simple and fits with existing syntax.
Test script:
---------------
<?php
trait testone {
public $test;
}
trait testtwo {
public $test;
}
//** this should work but doesn't
class traittest {
use testtwo, testone {
testone::$test insteadof testtwo;
testtwo::$test as $testalso;
}
}
?>
Expected result:
----------------
No errors or warnings.
Actual result:
--------------
Parse error: syntax error, unexpected '$test' (T_VARIABLE), expecting
identifier (T_STRING) in index.php on line 14
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=61147&edit=1
