How to work with big numbers in PHP?
such as
(6*27^0+17*27^1+11*27^2+18*27^3+25*27^4+4*27^5)^65537
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I think this number will fit in a normal int. Okay, that was before you put the ^65537 at the end. – user254875486 Mar 22 '10 at 08:59
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1Check http://stackoverflow.com/questions/211345/working-with-large-numbers-in-php – Anders Lindahl Mar 22 '10 at 08:59
4 Answers
4
GMP's actually faster than BCMath for bigintegers if you have it installed. If you have neither BCMath or GMP installed you can use phpseclib's pure-php biginteger implementation.
That implementation uses GMP or BCmath if they're available, in that order, and it's own internal implementation otherwise.
1
There are many options:
- The GMP extension
- The BCMath Extension
- Litipk PHP BigNumbers ( https://github.com/litipk/php-bignumbers )
- Flourish Numbers ( http://flourishlib.com/docs/fNumber )
castarco
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Given the question title, I'm assuming that the OP meant ^ as a power operator and not PHP's XOR operator, although the actual numbers make me doubt.
This can be achieved using the Brick\Math library (disclaimer: I authored it):
use Brick\Math\BigInteger;
// Not using BigInteger just yet as the numbers are small, although we could
$value = 6 * 27 ** 0
+ 17 * 27 ** 1
+ 11 * 27 ** 2
+ 18 * 27 ** 3
+ 25 * 27 ** 4
+ 4 * 27 ** 5;
echo BigInteger::of($value)->power(65537); // 529970661615774734826076722083948398443...
I'm sparing you the rest of the 514566 digits :)
BenMorel
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