Converting Roman Numerals to Arabic numbers

Using the static method toNumber you can convert Roman numerals like XLII to Arabic numbers like 42. Letters prefixed with an underscore represent numbers larger than 1000.

Conversion Table: Roman letter to Arabic number
Roman Arabic
I 1
V 5
X 10
L 50
C 100
D 500
M 1000
S, _V 5000
R, _X 10 000
P, _L 50 000
Q, _C 100 000
O, _D 500 000
N, _M 1 000 000

Converting Roman numerals to Arabic numbers

<?php
require_once 'Numbers/Roman.php';

echo 
Numbers_Roman::toNumber('XLII');
//returns: 42
?>
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Last updated: Fri, 22 Aug 2014 — Download Documentation
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