trader_bbands

(PECL trader >= 0.2.0)

trader_bbands — Bollinger Bands

Description

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

Parameters

real: Array of real values.
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.

Return Values

Returns an array with calculated data or false on failure.

Коментарии

Feb 17

Автор: geekgirl dot joy at gmail dot com


<?php



// According to Wikipedia and the internet:

// Bollinger Bands chart the price and volatility of a financial instrument over time 

// and yield an "envelope" minimum and maximum and middle "bands" of moving averages

// which provide a relative definition of high and low market prices

// Prices are "high" at or near the upper band and "low" at or near the lower band. 

// Bollinger Bands are considered useful for pattern recognition



$closes = array(112.82, 117.32, 113.49, 112, 115.355, 115.54, 112.13, 110.34, 106.84, 110.08, 111.81, 107.12, 108.22, 112.28);

$time_period = 5;

$upper_deviation_multiplier = 2.0;

$lower_deviation_multiplier = 2.0;



$ma_type = TRADER_MA_TYPE_SMA;  // Simple Moving Average

           //TRADER_MA_TYPE_EMA   - Exponential Moving Average

           //TRADER_MA_TYPE_WMA   - Weighted Moving Average

           //TRADER_MA_TYPE_DEMA  - Double Exponential Moving Average 

           //TRADER_MA_TYPE_TEMA  - Triple Exponential Moving Average 

           //TRADER_MA_TYPE_TRIMA - Triangular Moving Average

           //TRADER_MA_TYPE_KAMA  - Kaufman's Adaptive Moving Average

           //TRADER_MA_TYPE_MAMA  - MESA Adaptive Moving Average

           //TRADER_MA_TYPE_T3)   - T3 Moving Average

                 



var_dump(trader_bbands($closes, $time_period, $upper_deviation_multiplier, $lower_deviation_multiplier, $ma_type));



// Index 0 is "upper" band.

// Index 1 is "middle" band.

// Index 2 is "lower" band.



/*

array(3) {

  [0]=>

  array(10) {

    [4]=>

    float(118.025)

    [5]=>

    float(118.401)

    [6]=>

    float(116.739)

    [7]=>

    float(117.153)

    [8]=>

    float(118.563)

    [9]=>

    float(116.676)

    [10]=>

    float(113.996)

    [11]=>

    float(113.114)

    [12]=>

    float(112.577)

    [13]=>

    float(113.892)

  }

  [1]=>

  array(10) {

    [4]=>

    float(114.197)

    [5]=>

    float(114.741)

    [6]=>

    float(113.703)

    [7]=>

    float(113.073)

    [8]=>

    float(112.041)

    [9]=>

    float(110.986)

    [10]=>

    float(110.24)

    [11]=>

    float(109.238)

    [12]=>

    float(108.814)

    [13]=>

    float(109.902)

  }

  [2]=>

  array(10) {

    [4]=>

    float(110.369)

    [5]=>

    float(111.081)

    [6]=>

    float(110.667)

    [7]=>

    float(108.993)

    [8]=>

    float(105.519)

    [9]=>

    float(105.296)

    [10]=>

    float(106.484)

    [11]=>

    float(105.362)

    [12]=>

    float(105.051)

    [13]=>

    float(105.912)

  }

}

*/