(PECL win32ps >= 1.0.1)
win32_ps_list_procs — List running processes
Retrieves statistics about all running processes.
Returns FALSE on failure, or an array consisting of process statistics like win32_ps_stat_proc() returns for all running processes on success.
For those of you in the WAMP environment, here is a little function that you may find handy:
<?
function kill_proc($processName)
{
    @$processList = win32_ps_list_procs();
    foreach ($processList as $processArray)
    {
        $pid = $processArray['pid'];
        if (basename($processArray['exe']) == $processName)
        {            
            `taskkill /f /PID $pid 2>&1`;                    
        }
    }
}
?>
-CF