Base 2, 8, 16, 62, N Conversion - PHP
php
on October 24, 2012
A simple class that can easily be used to convert between Base10 and any other Base.
Base2.php
<?php
class Base2 extends BaseN {
public function __construct() {
parent::__construct(2, '01');
}
}
Base8.php
<?php
class Base8 extends BaseN {
public function __construct() {
parent::__construct(8, '01234567');
}
}
Base16.php
<?php
class Base16 extends BaseN {
public function __construct() {
parent::__construct(16, '0123456789ABCDEF');
}
}
Base62.php
<?php
class Base62 extends BaseN {
public function __construct() {
parent::__construct(62, '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ');
}
}
BaseN.php
<?php
abstract class BaseN {
private $chars;
private $base;
protected function __construct($base, $chars) {
$this->base = $base;
$this->chars = $chars;
if(mb_strlen($chars) != $base) {
error_log('base does not equal alphabet length');
}
}
public function encode($val) {
$val = (int) $val;
// can't handle numbers larger than 2^31-1 = 2147483647
$str = '';
do {
$i = $val % $this->base;
$str = $this->chars[$i] . $str;
$val = ($val - $i) / $this->base;
} while ($val > 0);
return $str;
}
public function decode($str) {
$str = (string)$str;
$len = mb_strlen($str);
$val = 0;
for ($i = 0; $i < $len; ++$i) {
$val += mb_strpos($this->chars, mb_substr($str, $i, 1)) * pow($this->base, $len - $i - 1);
}
return $val;
}
}
Usage Example:
$base = new Base16();
for($i = 0; $i < 100; $i++) {
$b16 = $base->encode($i);
$b10 = $base->decode($b16);
echo $i . ' => encode b16 => ' . $b16 . ' => decode b10 => ' . $b10 . '<br/>';
}
Output
0 => encode b16 => 0 => decode b10 => 0 1 => encode b16 => 1 => decode b10 => 1 2 => encode b16 => 2 => decode b10 => 2 3 => encode b16 => 3 => decode b10 => 3 4 => encode b16 => 4 => decode b10 => 4 5 => encode b16 => 5 => decode b10 => 5 6 => encode b16 => 6 => decode b10 => 6 7 => encode b16 => 7 => decode b10 => 7 8 => encode b16 => 8 => decode b10 => 8 9 => encode b16 => 9 => decode b10 => 9 10 => encode b16 => A => decode b10 => 10 11 => encode b16 => B => decode b10 => 11 12 => encode b16 => C => decode b10 => 12 13 => encode b16 => D => decode b10 => 13 14 => encode b16 => E => decode b10 => 14 15 => encode b16 => F => decode b10 => 15 16 => encode b16 => 10 => decode b10 => 16 17 => encode b16 => 11 => decode b10 => 17 18 => encode b16 => 12 => decode b10 => 18 19 => encode b16 => 13 => decode b10 => 19 20 => encode b16 => 14 => decode b10 => 20 21 => encode b16 => 15 => decode b10 => 21 22 => encode b16 => 16 => decode b10 => 22 23 => encode b16 => 17 => decode b10 => 23 24 => encode b16 => 18 => decode b10 => 24 25 => encode b16 => 19 => decode b10 => 25 26 => encode b16 => 1A => decode b10 => 26 27 => encode b16 => 1B => decode b10 => 27 28 => encode b16 => 1C => decode b10 => 28 29 => encode b16 => 1D => decode b10 => 29 30 => encode b16 => 1E => decode b10 => 30 31 => encode b16 => 1F => decode b10 => 31 32 => encode b16 => 20 => decode b10 => 32 33 => encode b16 => 21 => decode b10 => 33 34 => encode b16 => 22 => decode b10 => 34 35 => encode b16 => 23 => decode b10 => 35 36 => encode b16 => 24 => decode b10 => 36 37 => encode b16 => 25 => decode b10 => 37 38 => encode b16 => 26 => decode b10 => 38 39 => encode b16 => 27 => decode b10 => 39 40 => encode b16 => 28 => decode b10 => 40 41 => encode b16 => 29 => decode b10 => 41 42 => encode b16 => 2A => decode b10 => 42 43 => encode b16 => 2B => decode b10 => 43 44 => encode b16 => 2C => decode b10 => 44 45 => encode b16 => 2D => decode b10 => 45 46 => encode b16 => 2E => decode b10 => 46 47 => encode b16 => 2F => decode b10 => 47 48 => encode b16 => 30 => decode b10 => 48 49 => encode b16 => 31 => decode b10 => 49 50 => encode b16 => 32 => decode b10 => 50 51 => encode b16 => 33 => decode b10 => 51 52 => encode b16 => 34 => decode b10 => 52 53 => encode b16 => 35 => decode b10 => 53 54 => encode b16 => 36 => decode b10 => 54 55 => encode b16 => 37 => decode b10 => 55 56 => encode b16 => 38 => decode b10 => 56 57 => encode b16 => 39 => decode b10 => 57 58 => encode b16 => 3A => decode b10 => 58 59 => encode b16 => 3B => decode b10 => 59 60 => encode b16 => 3C => decode b10 => 60 61 => encode b16 => 3D => decode b10 => 61 62 => encode b16 => 3E => decode b10 => 62 63 => encode b16 => 3F => decode b10 => 63 64 => encode b16 => 40 => decode b10 => 64 65 => encode b16 => 41 => decode b10 => 65 66 => encode b16 => 42 => decode b10 => 66 67 => encode b16 => 43 => decode b10 => 67 68 => encode b16 => 44 => decode b10 => 68 69 => encode b16 => 45 => decode b10 => 69 70 => encode b16 => 46 => decode b10 => 70 71 => encode b16 => 47 => decode b10 => 71 72 => encode b16 => 48 => decode b10 => 72 73 => encode b16 => 49 => decode b10 => 73 74 => encode b16 => 4A => decode b10 => 74 75 => encode b16 => 4B => decode b10 => 75 76 => encode b16 => 4C => decode b10 => 76 77 => encode b16 => 4D => decode b10 => 77 78 => encode b16 => 4E => decode b10 => 78 79 => encode b16 => 4F => decode b10 => 79 80 => encode b16 => 50 => decode b10 => 80 81 => encode b16 => 51 => decode b10 => 81 82 => encode b16 => 52 => decode b10 => 82 83 => encode b16 => 53 => decode b10 => 83 84 => encode b16 => 54 => decode b10 => 84 85 => encode b16 => 55 => decode b10 => 85 86 => encode b16 => 56 => decode b10 => 86 87 => encode b16 => 57 => decode b10 => 87 88 => encode b16 => 58 => decode b10 => 88 89 => encode b16 => 59 => decode b10 => 89 90 => encode b16 => 5A => decode b10 => 90 91 => encode b16 => 5B => decode b10 => 91 92 => encode b16 => 5C => decode b10 => 92 93 => encode b16 => 5D => decode b10 => 93 94 => encode b16 => 5E => decode b10 => 94 95 => encode b16 => 5F => decode b10 => 95 96 => encode b16 => 60 => decode b10 => 96 97 => encode b16 => 61 => decode b10 => 97 98 => encode b16 => 62 => decode b10 => 98 99 => encode b16 => 63 => decode b10 => 99
Arrived
Ninja Turdle