(PECL trader >= 0.2.0)
trader_bbands — Bollinger Bands
$real
[, integer $timePeriod
[, float $nbDevUp
[, float $nbDevDn
[, integer $mAType
]]]] )
本函数还未编写文档，仅有参数列表。
real
timePeriod
nbDevUp
nbDevDn
mAType
Returns an array with calculated data or false on failure.