choval/base_convert

A base convert functino for converting extra large numbers from one base to another

v0.1.1 2019-08-15 23:37 UTC

Requires (Dev)

• phpunit/phpunit: ^7

MIT

• Osvaldo Jiang

README

A base_convert replacement that doesn't lose precision on large numbers.

A few differences from this convert:

• Second and third parameters (bases) accept:
  • an int between 2 and 64 (0-9a-zA-Z-_)
  • a string of unique characters
  • an array of unique characters
• A fourth parameter allows passing a padding length for the output
• A fifth parameter can be passed to be used as the padding character, else the first char of the base is used.

Negative numbers are converted to positive, just like base_convert.

Install

This function uses the GMP or the BCMath extension. Install one of them.

apt install php-gmp
apt install php-bcmath

Uses GMP > BCMath > PHP. If vanilla PHP, a E_USER_WARNING is triggered.

To Install this library:

composer require choval/base_convert

Usage

Procedural:

use function Choval\base_convert;
echo base_convert(1000, 10, 16);
// 3e8

Object:

use Choval\BaseConvert;
echo BaseConvert::from(1000)->to(16);
// 3e8

echo BaseConvert::from('3e8', 16)->to(64);
// fE

Padding:

$base = 'abcdefghijklmnopqrstuvwxyz';

echo BaseConvert::from(1000)->to($base);
// bmm

echo BaseConvert::from(1000)->to($base, 10);
// aaaaaaabmm

echo BaseConvert::from(1000)->to($base, 10, '#');
// #######bmm

echo base_convert(1000, 10, $base, 10, '#');
// #######bmm

echo BaseConvert::from('#######bmm', $base)->to(10);
// 1000

echo base_convert('#######bmm', $base, 10);
// 1000

Keep in mind the type of the parameters, '10' and 10 are not the same.

$base = 'abcdefghijklmnopqrstuvwxyz';

echo BaseConvert::from('bmm', $base)->to(10);
// 1000

echo BaseConvert::from('bmm', $base)->to('10');
// 0000010111

echo BaseConvert::from('bmm', $base)->to('01');
// 1111101000

echo BaseConvert::from('bmm', $base)->to(2);
// 1111101000

License

MIT, see LICENSE