This library convert numbers into roman numerals.
composer require joaoreisweb/numbers-in-roman
<?php
require_once realpath("vendor/autoload.php");
use joaoreisweb\NumbersInRoman;
$number_convert = new NumbersInRoman();
$number = 1500;
echo '<br>'.$number.' - '.$number_convert->convertIntToRoman($number);
$number = 1600;
echo '<br>'.$number.' - '.$number_convert->convertIntToRoman($number);
$number = 1000;
echo '<br>'.$number.' - '.$number_convert->convertIntToRoman($number);
$number = 1550;
echo '<br>'.$number.' - '.$number_convert->convertIntToRoman($number);
$roman = 'MMXXI';
echo '<br>'.$roman.' - '.$number_convert->convertRomanToInt($roman);
$roman = 'MCDDXIV';
echo '<br>'.$roman.' - '.$number_convert->convertRomanToInt($roman);
1500 - MD
1600 - MDC
1000 - M
1550 - MDL
MMXXI - 2021
MCDDXIV - 1914