php实现阿拉伯数字和罗马数字相互转换的方法
发布:smiling 来源: PHP粉丝网 添加日期:2021-05-22 20:52:00 浏览: 评论:0
这篇文章主要介绍了php实现阿拉伯数字和罗马数字相互转换的方法,涉及php字符串操作的相关技巧,具有一定参考借鉴价值,需要的朋友可以参考下,本文实例讲述了php实现阿拉伯数字和罗马数字相互转换的方法,分享给大家供大家参考,具体如下:
- <?php
- // Function that calculates the roman string to the given number:
- function dec2roman($f)
- {
- // Return false if either $f is not a real number,
- //$f is bigger than 3999 or $f is lower or equal to 0:
- if(!is_numeric($f) || $f > 3999 || $f <= 0) return false;
- // Define the roman figures:
- $roman = array(
- 'M' => 1000,
- 'D' => 500,
- 'C' => 100,
- 'L' => 50,
- 'X' => 10,
- 'V' => 5,
- 'I' => 1
- );
- // Calculate the needed roman figures:
- foreach($roman as $k => $v)
- if(($amount[$k] = floor($f / $v)) > 0)
- $f -= $amount[$k] * $v;
- // Build the string:
- $return = '';
- foreach($amount as $k => $v)
- {
- $return .= $v <= 3 ? str_repeat($k, $v) : $k . $old_k;
- $old_k = $k;
- }
- // Replace some spacial cases and return the string:
- return str_replace(array('VIV','LXL','DCD'),array('IX','XC','CM'),$return);
- }
- // echo dec2romen(1981);
- // Function to get the decimal value of a roman string:
- function roman2dec($str = '')
- {
- // Return false if not at least one letter is in the string:
- if(is_numeric($str)) return false;
- // Define the roman figures:
- $roman = array(
- 'M' => 1000,
- 'D' => 500,
- 'C' => 100,
- 'L' => 50,
- 'X' => 10,
- 'V' => 5,
- 'I' => 1
- );
- // Convert the string to an array of roman values:
- for($i = 0; $i < strlen($str); $i++)
- if(isset($roman[strtoupper($str[$i])]))
- $values[] = $roman[strtoupper($str[$i])];
- // Calculate the sum of that array:
- $sum = 0;
- while($current = current($values))
- {
- $next = next($values);
- $next > $current ? $sum += $next - $current + 0 * next($values) : $sum += $current;
- }
- // Return the value:
- return $sum;
- }
- // echo roman2dec(IX);
- ?>
Tags: php阿拉伯数字 php罗马数字
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