Numbers to Roman Numbers with php

Question

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

Answer 1

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