(PECL trader >= 0.2.0)
trader_minus_di — Minus Directional Indicator
$high
   , array $low
   , array $close
   [, int $timePeriod
  ] ) : array
high高价,浮点数数组。
low低价,浮点数数组。
close收盘价,浮点数数组。
timePeriodNumber of period. Valid range from 2 to 100000.
Returns an array with calculated data or false on failure.