(PECL trader >= 0.2.0)
trader_mfi — Money Flow Index
highHigh price, array of real values.
lowLow price, array of real values.
closeClosing price, array of real values.
volumeVolume traded, array of real values.
timePeriodNumber of period. Valid range from 2 to 100000.
Returns an array with calculated data or false on failure.