/**
* Transforms a given (big) number to a string value, based on the set alphabet.
*
* @param BigNumber $number
*
* @return string
*
* @throws ArithmeticException
*/
private function numToString(BigNumber $number)
{
$output = '';
while ($number->getValue() > 0) {
$previousNumber = clone $number;
$number = $number->divide($this->alphabetLength);
$digit = $previousNumber->mod($this->alphabetLength);
$output .= $this->alphabet[$digit->getValue()];
}
return $output;
}
