Edit report at https://bugs.php.net/bug.php?id=44848&edit=1
ID: 44848
Updated by: nikic@php.net
Reported by: nicolas dot grekas+php at gmail dot com
Summary: autoload fails with complex loading scheme
-Status: Open
+Status: Not a bug
Type: Feature/Change Request
Package: Scripting Engine problem
Operating System: *
PHP Version: 5.*
Block user comment: N
Private report: N
New Comment:
The comment by admin at ifyouwntblood dot de is correct, class B is not going to be defined until
the autoload for C finished. As such, everything is working as intended.
Previous Comments:
------------------------------------------------------------------------
[2009-06-03 08:44:20] admin at ifyouwntblood dot de
class B does not exist until __autoload() for C returns!
------------------------------------------------------------------------
[2009-04-19 23:04:32] nicolas dot grekas+php at gmail dot com
I just tried this on the command line :
http://windows.php.net/downloads/snaps/php-5.2-nts-win32-VC6-x86-latest.zip
still doesn't work sorry
------------------------------------------------------------------------
[2008-06-05 08:33:59] jille at hexon dot cx
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');
?>
------------------------------------------------------------------------
[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 https://bugs.php.net/bug.php?id=44848&edit=1