Okay, I found a way to solve it, so, here’s how to multiply very small floating point numbers without needing to set an explicit scale for the numbers:

```
function getDecimalPlaces($value) {
// first we get how many decimal places the small number has
// this code was gotten on another StackOverflow answer
$current = $value - floor($value);
for ($decimals = 0; ceil($current); $decimals++) {
$current = ($value * pow(10, $decimals + 1)) - floor($value * pow(10, $decimals + 1));
}
return $decimals;
}
function multiplySmallNumbers($value, $smallvalue) {
$decimals = getDecimalPlaces($smallvalue); // Then we get number of decimals on it
$smallvalue = sprintf('%.'.$decimals.'f',$smallvalue ); // Since bcmul uses the float values as strings, we get the number as a string with the correct number of zeroes
return (bcmul($value,$smallvalue));
}
```

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