Numbers to Roman Numbers with php

Question

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

Optimized and prettified function:

/**
 * @param int $number
 * @return string
 */
function numberToRomanRepresentation($number) {
    $map = 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);
    $returnValue = '';
    while ($number > 0) {
        foreach ($map as $roman => $int) {
            if($number >= $int) {
                $number -= $int;
                $returnValue .= $roman;
                break;
            }
        }
    }
    return $returnValue;
}

Another way to do that

<?php 
function ConverToRoman($num){ 
    $n = intval($num); 
    $res = ''; 

    //array of roman numbers
    $romanNumber_Array = 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 ($romanNumber_Array 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 result
    return $res; 
} 

echo ConverToRoman(23); 
?>

function rome($N){
    $c='IVXLCDM';
    for($a=5,$b=$s='';$N;$b++,$a^=7)
        for($o=$N%$a,$N=$N/$a^0;$o--;$s=$c[$o>2?$b+$N-($N&=-2)+$o=1:$b].$s);
    return $s;
}

// from polish wiki

There is an illegal offset issue.

Replace

$o=1:$b].$s);

with

$o=1:$b >0 ? $b : 0].$s);