#49472 [Ver]: Constants defined in Interfaces can be overridden
ID: 49472
Updated by: jani@php.net
Reported By: phil at mossyvale dot co dot uk
Status: Verified
Bug Type: Class/Object related
Operating System: *
PHP Version: 5.*, 6
New Comment:
<?php
interface ia {
const c = 'Sea';
}
class Foo implements ia {
// const c = "Lake";
// Attempting to override ia's constant c in
// this class triggers a fatal error.
}
class FooBar extends Foo implements ia {
const c = 'Ocean'; // No error, class constant
// overriding ia's definition.
public function show(){
// ia's definition is still accessible.
return ia::c;
}
}
$i = new FooBar;
echo FooBar::c;
echo $i->show();
?>
Previous Comments:
------------------------------------------------------------------------
[2009-09-05 10:08:19] phil at mossyvale dot co dot uk
Description:
------------
If an interface defines a constant and is then implemented by a class
which is then extended with a further class and both classes implement
the interface, the second class may override the interface constant
without a fatal error. Also present in 5.2.10 on FreeBSD 7.2
Reproduce code:
---------------
---
From manual page: language.oop5.interfaces
---
http://codepad.org/vStYX1Kz
Expected result:
----------------
Fatal error: Cannot inherit previously-inherited constant c from
interface ia ... on line 18
Actual result:
--------------
Program outputs "OceanSea" which indicates that the interface constant
is still available but the class constant with the same name overrides
it.
------------------------------------------------------------------------
--
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Thread (5 messages)