PHP Trader macd returns false

I want to use trader_macd but it returns always false. I am using the default parameters:

$data = [
0 => "0.06945900",
1 => "0.06945200",
2 => "0.06948100",
3 => "0.06944100",
4 => "0.06939800",
5 => "0.06941800",
6 => "0.06942300",
7 => "0.06940000",
8 => "0.06937700",
9 => "0.06937200",
10 => "0.06940000",
11 => "0.06939800",
12 => "0.06941100",
13 => "0.06944500",
14 => "0.06940100",
15 => "0.06942600",
16 => "0.06941500",
17 => "0.06941400",
18 => "0.06939900",
19 => "0.06941400",
20 => "0.06940700",
21 => "0.06938100",
22 => "0.06940400",
23 => "0.06937400",
24 => "0.06937000",
25 => "0.06939700"]

$result = trader_macd($data, 12, 26, 9)

When I set the last parameter ($signalPeriod) then get an array with 0 values:

0 => array:1 [▼
  24 => -0.0
]
1 => array:1 [▼
  24 => -0.0
]
2 => array:1 [▼
  24 => -0.0
]

When I am using other methods like trader_ema with same $data it works fine.

I also set trader.real_precision to 8.

ini_set('trader.real_precision', '8');

What I am doing wrong?

My Systems uses php 7.2.7 with trader 0.5.0.

Solution

You don't have enough data to calculate the signal line you chose (9 day EMA of MACD line). Add eight more entries to your data array, and you'll get a result. Or lower the signal line period