(PECL trader >= 0.2.0)
trader_mfi — Money Flow Index
$high
   , array $low
   , array $close
   , array $volume
   [, integer $timePeriod
  ] )
high
    High price, array of real values.
low
    Low price, array of real values.
close
    Closing price, array of real values.
volume
    Volume traded, array of real values.
timePeriod
    Number of period. Valid range from 2 to 100000.
Returns an array with calculated data or false on failure.