trader_bbands

(PECL trader >= 0.2.0)

trader_bbands — Bollinger Bands

array trader_bbands ( array $real [, integer $timePeriod [, float $nbDevUp [, float $nbDevDn [, integer $mAType ]]]] )

real: 浮点数数组。
timePeriod: Number of period. Valid range from 2 to 100000.
nbDevUp: Deviation multiplier for upper band. Valid range from TRADER_REAL_MIN to TRADER_REAL_MAX.
nbDevDn: Deviation multiplier for lower band. Valid range from TRADER_REAL_MIN to TRADER_REAL_MAX.
mAType: Type of Moving Average. TRADER_MA_TYPE_* series of constants should be used.

Returns an array with calculated data or false on failure.