/**
* Converts base of numbers. Supports base 2 to 36.
* Note: Native support exists http://php.net/base_convert.
*
* @author Jitendra Adhikari <*****@*****.**>
*
* @param string $num Numeric string.
* @param int $tobase To base
* @param int $frombase From base (defaults to 10)
*
* @return string The number with converted base
*
* @throws InvalidArgumentException If input string or base is invalid
*/
function convert_base($num, $tobase, $frombase = 10)
{
if ($tobase == $frombase) {
return $num;
}
$map = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
if ($tobase > strlen($map) or $tobase < 2 or $frombase > strlen($map) or $frombase < 2) {
throw new \InvalidArgumentException('Given base not yet supported');
}
// Validate $num
if (trim(strtoupper($num), substr($map, 0, $frombase))) {
throw new \InvalidArgumentException(sprintf('%s is not valid base %s number', $num, $frombase));
}
// Adapt to base 10 (only for first go, not used by recursion)
if (10 != $frombase) {
$tmp = 0;
foreach (str_split(strrev($num)) as $pow => $n) {
$tmp += stripos($map, $n) * pow($frombase, $pow);
}
$num = $tmp;
}
if ($num < $tobase) {
return $map[(int) $num];
}
return convert_base(floor($num / $tobase), $tobase) . $map[$num % $tobase];
}
<?php
//Include BaseX class
include_once "Math/Basex.php";
//mirror HEX character set an convert current code to new code
$newcode = convert_base("5c", "012345679abcdef", "fedcba9876543210");
echo $newcode . " (Result: a9)\n";
$newcode = Math_Basex::baseConvert("14", 10, 2);
echo $newcode . " (Result: 1110)\n";
function convert_base($code, $oldbase, $newbase)
{
// take old base an input
$base = new Math_Basex($oldbase);
//convert code to base10 decimal number
$number = $base->toDecimal($code);
//change to the new base
$base->setBase($newbase);
//encode the decimal number and return the result to the function
return $base->toBase($number);
}
/**
* @depends testConvertBaseException
* @expectedException \InvalidArgumentException
*/
public function testConvertBaseException2()
{
convert_base('1234', 1, 10);
}
