Question: Using PHP, design a function that given a Roman numeral (Wikipedia link.), in input, is able to compute the modern HinduArabic numeral (wikipedia link), system

Using PHP, design a function that given a Roman numeral (Wikipedia link.), in input, is able to compute the modern HinduArabic numeral (wikipedia link), system representation (aka, 0123456789).

For example:

Input	Output
VI	6
IV	4
MCMXC	1990
IX	9

Be sure to add all the necessary checks and at least one testing function.
Try to split the logic in more small functions.

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