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