cvs: php4 /pear/Numbers Roman.php
| From: | Sterling Hughes | Date: | Wed, 27 Dec 2000 17:49:11 +0000 |
| Subject: | cvs: php4 /pear/Numbers Roman.php | ||
| Groups: | php.cvs | ||
| Request: | Send a blank email to php-cvs+get-3310@lists.php.net to get a copy of this message | ||
sterling Wed Dec 27 09:49:11 2000 EDT
Added files:
/php4/pear/Numbers Roman.php
Log:
Add the Numbers_Roman class for converting to and from Roman numerals.
Index: php4/pear/Numbers/Roman.php
+++ php4/pear/Numbers/Roman.php
<?php
//
// +----------------------------------------------------------------------+
// | PHP version 4.0 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997, 1998, 1999, 2000 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt.
|
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Authors: Sterling Hughes <sterling@php.net> |
// +----------------------------------------------------------------------+
//
require_once("PEAR.php");
// {{{ Numbers_Roman
/**
* The Numbers_Roman class provides utilities to convert roman numerals to
* arabic numbers and convert arabic numbers to roman numerals
*
* @access public
* @author Sterling Hughes <sterling@php.net>
* @since PHP 4.0.5
*/
class Numbers_Roman extends PEAR
{
// {{{ toNumber()
/**
* Converts a roman numeral to a number
*
* @param string $roman The roman numeral to convert
*
* @return integer $num The number corresponding to the
* given roman numeral
*
* @access public
* @author Sterling Hughes <sterling@php.net>
* @since PHP 4.0.5
*/
function toNumber($roman)
{
$conv = array(
array("letter" => 'I', "number" => 1),
array("letter" => 'V', "number" => 5),
array("letter" => 'X', "number" => 10),
array("letter" => 'L', "number" => 50),
array("letter" => 'C', "number" => 100),
array("letter" => 'D', "number" => 500),
array("letter" => 'M', "number" => 1000),
array("letter" => 0, "number" => 0)
);
$arabic = 0;
$state = 0;
$sidx = 0;
$len = strlen($roman);
while ($len >= 0) {
$i = 0;
$sidx = $len;
while ($conv[$i]['number'] > 0) {
if (strtoupper($roman[$sidx]) == $conv[$i]['letter']) {
if ($state > $conv[$i]['number']) {
$arabic -= $conv[$i]['number'];
} else {
$arabic += $conv[$i]['number'];
$state = $conv[$i]['number'];
}
}
$i++;
}
$len--;
}
return($arabic);
}
// }}}
// {{{ toRoman()
/**
* Converts a number to its roman numeral representation
*
* @param integer $num An integer between 0 and 3999 inclusive
* that should be converted to a roman numeral
*
* @return string $roman The corresponding roman numeral
*
* @access public
* @author Sterling Hughes <sterling@php.net>
* @since PHP 4.0.5
*/
function toRoman($num) {
$conv = array(10 => array('X', 'C', 'M'),
5 => array('V', 'L', 'D'),
1 => array('I', 'X', 'C'));
$roman = '';
$num = (int) $num;
$digit = (int) $num / 1000;
$num -= $digit * 1000;
while ($digit > 0) {
$roman .= 'M';
$digit--;
}
for ($i = 2; $i >= 0; $i--) {
$power = pow(10, $i);
$digit = (int) $num / $power;
$num -= $digit * $power;
if (($digit == 9) || ($digit == 4)) {
$roman .= $conv[1][$i] . $conv[$digit+1][$i];
} else {
if ($digit >= 5) {
$roman .= $conv[5][$i];
$digit -= 5;
}
while ($digit > 0) {
$roman .= $conv[1][$i];
$digit--;
}
}
if ($num > 0) {
return('');
}
return($roman);
}
// }}}
}
// }}}
?>