Description:
------------
I have a scheduler script, which constantly runs in the background, invokes processes, and pipes their output back to stdout.

It seems that proc_open() or proc_close() call leaks handles on Windows platform (I'm running PHP 5.0.2).

In the example code, the handles count would increment by 1 each time invoke() is called, in other places I saw similar code leak 4 handles at once during each iteration.


Reproduce code:
---------------
while(1)
{
	echo("---\n");
	invoke();
	sleep(5);
}

function invoke()
{
	$commandLine = "echo hello";

	$fileDescriptors = array(
					1 => array("pipe", "w"),
					2 => array("pipe", "w")
				);

	$pipes = array();

	$processHandle	= proc_open($commandLine,
                                  $fileDescriptors, $pipes);

	if (is_resource($processHandle))
	{
		foreach($pipes as $pipeID => $pipeHandle)
			fclose($pipeHandle);

		proc_close($processHandle);
	}
}


Expected result:
----------------
I expected the handle count to increment by X, and decrement by X after the process completes.
(where it's logical to assume that X = number of pipes + 1 for the child process handle)


Actual result:
--------------
In fact, the handles count (in windows task manager) for the php.exe process running the script incremented by 1 each time invoke() in the example code was executed.