(PECL trader >= 0.2.0)
trader_bbands — Bollinger Bands
$real
   [, integer $timePeriod
   [, float $nbDevUp
   [, float $nbDevDn
   [, integer $mAType
  ]]]] )
This function is currently not documented; only its argument list is available.
real
timePeriod
nbDevUp
nbDevDn
mAType
Returns an array with calculated data or false on failure.