This function returns an array of arrays :
index [0]: %K values
index [1]: %D values
(PECL trader >= 0.2.0)
trader_stoch — Stochastic
$high,$low,$close,$fastK_Period = ?,$slowK_Period = ?,$slowK_MAType = ?,$slowD_Period = ?,$slowD_MAType = ?
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。
fastK_PeriodTime period for building the Fast-K line. Valid range from 1 to 100000.
slowK_PeriodSmoothing for making the Slow-K line. Valid range from 1 to 100000, usually set to 3.
slowK_MATypeType of Moving Average for Slow-K. TRADER_MA_TYPE_* series of constants should be used.
slowD_PeriodSmoothing for making the Slow-D line. Valid range from 1 to 100000.
slowD_MATypeType of Moving Average for Slow-D. TRADER_MA_TYPE_* series of constants should be used.
Returns an array with calculated data or false on failure.