Decimal to Roman

<?php

$number = readline();
$output = "";
$romanDecimal[] = array("M"=>1000, "CM"=>900,"D"=>500,"CD"=>400,"C"=>100,"XC"=>90,"L"=>50,"LX"=>40,"X"=>10,"IX"=>9,"V"=>5,"IV"=>4,"I"=>1);
//separate the numbers


switch ($number) {
    case ($number>=1000):
        $thousands = $number/1000;
        $multiplier = floor($thousands) * 1000;

        $number = $number - $multiplier;
        //echo "M:" . floor($thousands) . "\n";
        //echo "Remaining number: " . $number . "\n";


    case ($number>=900):
        $CM = $number/900;
        $multiplier = floor($CM) * 900;

        $number = $number - $multiplier;
        //echo "CM:" . floor($CM) . "\n";
        //echo "Remaining number: " . $number . "\n";

    case ($number>=500):
        $fhundred= $number/500;
        $multiplier = floor($fhundred) * 500;

        $number = $number - $multiplier;
        //echo "D:" . floor($fhundred) . "\n";
        //echo "Remaining number: " . $number . "\n";

    case ($number>=400):
        $CD= $number/400;
        $multiplier = floor($CD) * 400;

        $number = $number - $multiplier;
        //echo "CD:" . floor($CD) . "\n";
        //echo "Remaining number: " . $number . "\n";

    case ($number>=100):
        $hundred= $number/100;
        $multiplier = floor($hundred) * 100;

        $number = $number - $multiplier;
        //echo "C:" . floor($hundred) . "\n";
        //echo "Remaining number: " . $number . "\n";

    case ($number>=90):
        $XC = $number/90;
        $multiplier = floor($XC) * 90;

        $number = $number - $multiplier;
        //echo "XC:" . floor($XC) . "\n";
        //echo "Remaining number: " . $number . "\n";

    case ($number>=50):
        $fifty = $number/50;
        $multiplier = floor($fifty) * 50;

        $number = $number - $multiplier;
        //echo "L:" . floor($fifty) . "\n";
        //echo "Remaining number: " . $number . "\n";
    case ($number>=40):
        $XL = $number/40;
        $multiplier = floor($XL) * 40;

        $number = $number - $multiplier;
        //echo "XL:" . floor($XL) . "\n";
        //echo "Remaining number: " . $number . "\n";
    case ($number>=10):
        $tens = $number/10;
        $multiplier = floor($tens) * 10;

        $number = $number - $multiplier;
        //echo "X:" . floor($tens) . "\n";
        //echo "Remaining number: " . $number . "\n";
    case ($number>=9):
        $IX = $number/9;
        $multiplier = floor($IX) * 9;

        $number = $number - $multiplier;
        //echo "IX:" . floor($IX) . "\n";
        //echo "Remaining number: " . $number . "\n";
    case ($number>=5):
        $five = $number/5;
        $multiplier = floor($five) * 5;

        $number = $number - $multiplier;
        //echo "V:" . floor($five) . "\n";
        //echo "Remaining number: " . $number . "\n";
    case ($number>=4):
        $IV = $number/4;
        $multiplier = floor($IV) * 4;

        $number = $number - $multiplier;
        //echo "IV:" . floor($IV) . "\n";
        //echo "Remaining number: " . $number . "\n";
    case ($number>=1):
        $one = $number/1;
        $multiplier = floor($one) * 1;

        $number = $number - $multiplier;
        //echo "I:" . floor($one) . "\n";
        //echo "Remaining number: " . $number . "\n";

}

for ($i=0;$i<floor($thousands);$i++) {
    $output.= "M";
}
for ($i=0;$i<floor($CM);$i++) {
    $output.= "CM";
}
for ($i=0;$i<floor($fhundred);$i++) {
    $output.= "D";
}
for ($i=0;$i<floor($CD);$i++) {
    $output.= "CD";
}
for ($i=0;$i<floor($hundred);$i++) {
    $output.= "C";
}
for ($i=0;$i<floor($XC);$i++) {
    $output.= "XC";
}
for ($i=0;$i<floor($fifty);$i++) {
    $output.= "L";
}
for ($i=0;$i<floor($XL);$i++) {
    $output.= "XL";
}
for ($i=0;$i<floor($tens);$i++) {
    $output.= "X";
}
for ($i=0;$i<floor($IX);$i++) {
    $output.= "IX";
}
for ($i=0;$i<floor($five);$i++) {
    $output.= "V";
}
for ($i=0;$i<floor($IV);$i++) {
    $output.= "IV";
}
for ($i=0;$i<floor($one);$i++) {
    $output.= "I";
}
echo $output;







?>