#44848 [Opn->Fbk]: autoload fails with complex loading scheme

 ID:               44848
 Updated by:       [email protected]
 Reported By:      nicolas dot grekas+php at gmail dot com
-Status:           Open
+Status:           Feedback
 Bug Type:         Scripting Engine problem
 Operating System: *
 PHP Version:      5.*CVS, 6CVS (2009-01-21)
 New Comment:

Please try using this CVS snapshot:

  http://snaps.php.net/php5.2-latest.tar.gz
 
For Windows:

  http://windows.php.net/snapshots/




Previous Comments:
------------------------------------------------------------------------

[2009-01-05 20:59:06] pinochet dot pl at gmail dot com

I have the same behavior on 5.3 version and 1.01.2009 Snap UBUNTU 8.10

------------------------------------------------------------------------

[2008-11-03 10:49:21] nicolas dot grekas+php at gmail dot com

Doesn't work with windows snaps [2008-Nov-03 08:00:00].
I got exactly the same behavior

------------------------------------------------------------------------

[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



------------------------------------------------------------------------


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Edit this bug report at http://bugs.php.net/?id=44848&edit=1