Is there a BigInteger class in PHP?

Question

Is there a BigInteger class in PHP? If so, how do I access it or use it?

Answer 1

Hopefully helpfull links :

• http://php.net/manual/en/ref.bc.php
• http://php.net/manual/en/ref.gmp.php

EDIT: Math_BigInteger

Example from http://phpseclib.sourceforge.net/documentation/math.html :

Implements an arbitrary precision integer arithmetic library. Uses gmp or bcmath, if available, and an internal implementation, otherwise.

<?php
    include('Math/BigInteger.php');

    $a = new Math_BigInteger(2);
    $b = new Math_BigInteger(3);

    $c = $a->add($b);

    echo $c->toString(); // outputs 5
?>

Answer 2

Even though this question is old, it comes up as first result when Googling for BigInteger PHP, so for anyone interested, I open-sourced a library called Brick\Math offering BigInteger, BigDecimal and BigRational classes.

---

Usage

use Brick\Math\BigInteger;
use Brick\Math\RoundingMode;

Addition:

echo BigInteger::of('9999999999999999999999999')->plus(1);
// 10000000000000000000000000

Subtraction:

echo BigInteger::of('10000000000000000000000000')->minus(1);
// 9999999999999999999999999

Multiplication:

echo BigInteger::of('3333333333333333333333333')->multipliedBy(11);
// 36666666666666666666666663

Division:

echo BigInteger::of('1000000000000000000000')->dividedBy(3, RoundingMode::UP);
// 333333333333333333334

Exponentiation:

echo BigInteger::of(11)->power(50);
// 11739085287969531650666649599035831993898213898723001

You can easily chain method calls:

echo BigInteger::of(3)->multipliedBy(7)->minus(1)->dividedBy(10);

---

Installation

Just install with Composer and you're done:

composer require brick/math

The library automatically uses the GMP and BCMath extensions when available, to speed up calculations, but will also work without them thanks to a pure PHP implementation.