General :: SSH Into A Windows PC And Run A Command From PHP Script?

I am trying to SSH into a windows PC and run a command from a PHP script Here is a typical command I am trying to execute, I also need to run a batch file on the windows box.

Code:

ssh user@192.168.10.131 cmd /c dir

The above works fine when typed into a terminal window on the Linux server but when I put that in my PHP script it refuses to work The following is a fragment of code from my PHP script

Code:

$command = 'ssh user@192.168.10.131 "cmd /c dir"';
$return = shell_exec("$command");
Server = Linux (SME) with PHP5
Client = WinXP Pro