Edit report at https://bugs.php.net/bug.php?id=63359&edit=1
ID: 63359
Comment by: maciej dot sz at gmail dot com
Reported by: maciej dot sz at gmail dot com
Summary: Defining a interface const with value of another
constant triggers fatal error
Status: Open
Type: Feature/Change Request
Package: Scripting Engine problem
Operating System: Linux
PHP Version: 5.4.8
Block user comment: N
Private report: N
New Comment:
How come a feature request? This is an obvious bug.
Previous Comments:
------------------------------------------------------------------------
[2012-11-14 15:21:33] larue...@php.net
change to feature request.
------------------------------------------------------------------------
[2012-11-14 14:52:29] dagguh at gmail dot com
This is especially painful when you are trying to work your way around lack of
class literal.
<?
namespace pl\dagguh\building;
class Kitchen implements Room {
const CLASS_NAME = "pl\\dagguh\\building\\Kitchen";
}
interface Room {
const CLASS_NAME = "pl\\dagguh\\building\\Room";
}?>
--------
You often need the class name for mocking frameworks.
------------------------------------------------------------------------
[2012-10-25 10:45:43] maciej dot sz at gmail dot com
Description:
------------
When a constant is defined in an interface with a value of another class or
interface constant, a fatal error is triggered:
Fatal error: Cannot inherit previously-inherited or override constant FOO from
interface IMyInterface in Bar.php on line 3
To reproduce this following conditions must be met (took me 2 days to figure
this out):
- the constant value must be defined as another class/interface constant
- classes and interfaces must be autoloaded on demand
- two classes must implement the interface
- one class must inherit the other one
- the super class must be instantiated before the sub class
Seems like this is related to bug #33732 and bug #38286 but is still not fixed.
Test script:
---------------
File IMyInterface.php:
----------------------
<?php
interface IMyInterface
{
// Use any class or interface constant as value of FOO.
// I'll just use some constant available out of the box, to keep it simple:
const FOO = FilesystemIterator::CURRENT_AS_PATHNAME;
}
File Foo.php:
----------------------
<?php
class Foo implements IMyInterface {}
File Bar.php:
----------------------
<?php
class Bar extends Foo implements IMyInterface {}
File index.php:
----------------------
<?php
date_default_timezone_set('Europe/Warsaw');
spl_autoload_register(function($cname){
if ( class_exists($cname, false) || interface_exists($cname, false) ) {
return;
}
require_once "{$cname}.php";
});
// Foo is super-class for Bar.
// uncomment below line to trigger the error:
$F = new Foo();
// this should run without errors at any time, but if Foo is instantiated
// prior to this line, then the error is triggered:
$B = new Bar();
Expected result:
----------------
No errors, the code is correct.
Actual result:
--------------
Fatal error: Cannot inherit previously-inherited or override constant FOO from
interface IMyInterface in Bar.php on line 3
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=63359&edit=1
