ID: 44848
Comment by: jille at hexon dot cx
Reported By: nicolas dot grekas+php at gmail dot com
Status: Open
Bug Type: Scripting Engine problem
Operating System: Linux & Windows
PHP Version: 5.2.5
New Comment:
I tried creating a work-around for this.
However, this didn't work:
So class B is half-existent ?
You can not define it, but it also doesn't exists...
<?php
function __autoload($class)
{
switch ($class)
{
case 'A':
case 'B':
if(class_exists('B', false))
return;
class B extends C {};
break;
case 'C':
class C {};
class A extends B {};
break;
}
}
echo (int) class_exists('A');
?>
Previous Comments:
------------------------------------------------------------------------
[2008-04-27 21:22:46] nicolas dot grekas+php at gmail dot com
Description:
------------
Hard to explain, see code... I think that PHP should be able to handle
this kind of loading scheme.
Here is what I thought this code would do :
1. __autoload('A') is called
2. inside this call for A:
2.1 class B is defined, which extends C
2.2 as C is not defined, __autoload('C') is called
2.3 inside this call for C:
2.3.1 class C is defined
2.3.2 (now we have everything needed for class B, haven't we ?)
2.3.3 class A extends B
2.4 we leave the __autoload('C') context
3. we leave the __autoload('A') context
The bug is at step 2.3.3 : "class A extends B" triggers an
autoload('B'), which should not occurs, as B should be already defined,
thanks to 2.3.2...
Reproduce code:
---------------
<?php
function __autoload($class)
{
switch ($class)
{
case 'A':
case 'B':
class B extends C {};
break;
case 'C':
class C {};
class A extends B {};
break;
}
}
echo (int) class_exists('A');
Expected result:
----------------
1
Actual result:
--------------
Fatal error: Cannot redeclare class B in [...] on line 9
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=44848&edit=1
