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  1. <?php
  2.  
  3. function roman2number($roman){
  4.     $conv = array(
  5.         array("letter" => 'I', "number" => 1),
  6.         array("letter" => 'V', "number" => 5),
  7.         array("letter" => 'X', "number" => 10),
  8.         array("letter" => 'L', "number" => 50),
  9.         array("letter" => 'C', "number" => 100),
  10.         array("letter" => 'D', "number" => 500),
  11.         array("letter" => 'M', "number" => 1000),
  12.         array("letter" => 0, "number" => 0)
  13.     );
  14.     $arabic = 0;
  15.     $state = 0;
  16.     $sidx = 0;
  17.     $len = strlen($roman);
  18.  
  19.     while ($len >= 0) {
  20.         $i = 0;
  21.         $sidx = $len;
  22.  
  23.         while ($conv[$i]['number'] > 0) {
  24.             if (strtoupper(@$roman[$sidx]) == $conv[$i]['letter']) {
  25.                 if ($state > $conv[$i]['number']) {
  26.                     $arabic -= $conv[$i]['number'];
  27.                 } else {
  28.                     $arabic += $conv[$i]['number'];
  29.                     $state = $conv[$i]['number'];
  30.                 }
  31.             }
  32.             $i++;
  33.         }
  34.  
  35.         $len--;
  36.     }
  37.  
  38.     return($arabic);
  39. }
  40.  
  41. echo roman2number('IV');
  42.  
Success #stdin #stdout 0.01s 23936KB
comments ()
stdin 
Standard input is empty
stdout 
4
https://ideone.com/1Vd39O
language:
PHP (php 7.3.5)
created:
6 years ago
visibility:
secret

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