Description:
------------
When i make an Apache Bench with more than 1 concurrency access on this peace of code it make my apache crash but just on physical windows machine (Work on Linux and Windows Virtual Machines)

Here is the apache bench :
ab.exe -n100 -c2 http://localhost/bug.php

Reproduce code:
---------------
<?php

/**
 * FileName : bug.php
 */

class foo {
	public $a = null;
	public $b = null;
}


for($i = 0 ; $i < 20 ; $i++)
{
	$reflection = new ReflectionClass('foo');
	$reflection->getProperties();
	++$cpt;
}


Expected result:
----------------
No apache Crash 

Actual result:
--------------
zend_mm_heap corrupted
zend_mm_heap coError in my_thread_global_end(): 66 threads didn't exit
[Fri May 23 17:22:49 2008] [notice] Parent: child process exited with status 1 -- Restarting.
[Fri May 23 17:22:49 2008] [notice] Apache/2.2.8 (Win32) PHP/5.2.5 configured -- resuming normal operations
[Fri May 23 17:22:49 2008] [notice] Server built: Jan 18 2008 00:37:19
[Fri May 23 17:22:49 2008] [notice] Parent: Created child process 3052
[Fri May 23 17:22:49 2008] [notice] Child 3052: Child process is running
[Fri May 23 17:22:49 2008] [notice] Child 3052: Acquired the start mutex.
[Fri May 23 17:22:49 2008] [notice] Child 3052: Starting 64 worker threads.
[Fri May 23 17:22:49 2008] [notice] Child 3052: Starting thread to listen on port 80.