Answer 1

PHP Solution:

$romans = 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,
);

$roman = 'MMMCMXCIX';
$result = 0;

foreach ($romans as $key => $value) {
while (strpos($roman, $key) === 0) {
$result += $value;
$roman = substr($roman, strlen($key));
}
}
echo $result;

Hope it works for you.

Source: https://goo.gl/CcIvly