function BigInteger::fromArbitraryBase

Parses a string containing an integer in an arbitrary base, using a custom alphabet.

Because this method accepts an alphabet with any character, including dash, it does not handle negative numbers.

@psalm-pure

Parameters

string $number The number to parse.:

string $alphabet The alphabet, for example '01' for base 2, or '01234567' for base 8.:

Throws

NumberFormatException If the given number is empty or contains invalid chars for the given alphabet.

\InvalidArgumentException If the alphabet does not contain at least 2 chars.

File

vendor/brick/math/src/BigInteger.php, line 134

Class

BigInteger

An arbitrary-size integer.

Namespace

Brick\Math

Code

public static function fromArbitraryBase(string $number, string $alphabet) : BigInteger {
    if ($number === '') {
        throw new NumberFormatException('The number cannot be empty.');
    }
    $base = \strlen($alphabet);
    if ($base < 2) {
        throw new \InvalidArgumentException('The alphabet must contain at least 2 chars.');
    }
    $pattern = '/[^' . \preg_quote($alphabet, '/') . ']/';
    if (\preg_match($pattern, $number, $matches) === 1) {
        throw NumberFormatException::charNotInAlphabet($matches[0]);
    }
    $number = Calculator::get()->fromArbitraryBase($number, $alphabet, $base);
    return new BigInteger($number);
}