public static function kill($pid, $force = false, $timeout = 3)
    {
        return self::sendSignal($pid, $force ? SIGKILL : SIGTERM, $timeout);
    }
public static function kill($pid, $force = false, $timeout = 3)
    {
        return self::sendSignal($pid, $force ? SIGKILL : SIGTERM, $timeout);
    }
public static function kill ( $ pid , $ force = false , $ timeout = 3 ) { return self :: sendSignal ( $ pid , $ force ? SIGKILL : SIGTERM , $ timeout ) ; }
send kill signal to the process
@param int $pid
@param bool $force
@param int $timeout
@return bool
send kill signal to the process