Just PHP FUN 106.

just_php_fun_106.md

Just PHP FUN 106.

• https://www.codewars.com/kata/51b6249c4612257ac0000005 Roman Numerals Decoder.

Started at 22:59 18.09.2020 Friday Sep.
Finished at 23:26 18.09.2020 Friday Sep. (0hrs 27minutes)

roman_convertor.php

<?php
# https://www.codewars.com/kata/51b6249c4612257ac0000005 Roman Numerals Decoder.
function solution ($roman) {
  $number = 0;
  $level = 0;
  $map = [
    "I" => [1,0],
    "V" => [5,1],
    "X" => [10,2],
    "L" => [50,3],
    "C" => [100,4],
    "D" => [500,5],
    "M" => [1000,6],
  ];
  
  $len = strlen($roman);
  
  for($i = $len - 1; $i >= 0; $i -= 1){
    list($value,$char_level) = $map[$roman[$i]];
    if($char_level >= $level){
      $number += $value;
      $level = $char_level;
    }else{
      $number -= $value;
    }
  }
  
  return $number;
}