trader_bbands

(PECL trader >= 0.2.0)

trader_bbands — Bollinger Bands

说明

trader_bbands ( array $real , int $timePeriod = ? , float $nbDevUp = ? , float $nbDevDn = ? , int $mAType = ? ) : array

参数

real

浮点数数组。

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.

返回值

Returns an array with calculated data or false on failure.

User Contributed Notes

geekgirl dot joy at gmail dot com 17-Feb-2021 08:33
<?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)
  }
}
*/