数字与PHP的罗马数字 [英] Numbers to Roman Numbers with php

问题描述

我需要普通的数字转换为用PHP罗马数字和我有这个code：

I need to transform ordinary numbers to Roman numerals with php and I have this code:

        <?php

function roman2number($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);
}


function number2roman($num,$isUpper=true) {
    $n = intval($num);
    $res = '';

    /*** roman_numerals array ***/
    $roman_numerals = array(
        'M' => 1000,
        'CM' => 900,
        'D' => 500,
        'CD' => 400,
        'C' => 100,
        'XC' => 90,
        'L' => 50,
        'XL' => 40,
        'X' => 10,
        'IX' => 9,
        'V' => 5,
        'IV' => 4,
        'I' => 1
    );

    foreach ($roman_numerals as $roman => $number)
    {
        /*** divide to get matches ***/
        $matches = intval($n / $number);

        /*** assign the roman char * $matches ***/
        $res .= str_repeat($roman, $matches);

        /*** substract from the number ***/
        $n = $n % $number;
    }

    /*** return the res ***/
    if($isUpper) return $res;
    else return strtolower($res);
}

/* TEST */
echo $s=number2roman(6,true);
echo "\n and bacK:\n";
echo roman2number($s);


?>

尝试这种方式，但不工作：

try this way but does not work:

echo $s=number2roman((.$row['id'].),true);
echo "\n and bacK:\n";
echo roman2number($s);

问题是，我需要改变号码是我的SQL数据库的读数，不知道怎么样了，从通过。

the problem is that I need to change numbers are readings of my sql database and do not know how to, from and through.

推荐答案

我发现这个code这里：<一href=\"http://php.net/manual/en/function.base-convert.php\">http://php.net/manual/en/function.base-convert.php

I found this code here: http://php.net/manual/en/function.base-convert.php

<?php 

function romanic_number($integer, $upcase = true) 
{ 
    $table = array('M'=>1000, 'CM'=>900, 'D'=>500, 'CD'=>400, 'C'=>100, 'XC'=>90, 'L'=>50, 'XL'=>40, 'X'=>10, 'IX'=>9, 'V'=>5, 'IV'=>4, 'I'=>1); 
    $return = ''; 
    while($integer > 0) 
    { 
        foreach($table as $rom=>$arb) 
        { 
            if($integer >= $arb) 
            { 
                $integer -= $arb; 
                $return .= $rom; 
                break; 
            } 
        } 
    } 

    return $return; 
} 

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