trader_bbands

(PECL trader >= 0.2.0)

trader_bbands — Bollinger Bands

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

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real: ��顣
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.

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Returns an array with calculated data or false on failure.