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  1. <?php
  2.  
  3. /**
  4.  * Convert a roman numeral to number
  5.  *
  6.  * @param $roman
  7.  * @return int
  8.  */
  9. function ma_roman2number($roman){
  10.     if (empty($roman)) return;
  11.  
  12.     $conv = array(
  13.         array("letter" => 'I', "number" => 1),
  14.         array("letter" => 'i', "number" => 1),
  15.         array("letter" => 'V', "number" => 5),
  16.         array("letter" => 'v', "number" => 5),
  17.         array("letter" => 'X', "number" => 10),
  18.         array("letter" => 'x', "number" => 10),
  19.         array("letter" => 'L', "number" => 50),
  20.         array("letter" => 'l', "number" => 50),
  21.         array("letter" => 'C', "number" => 100),
  22.         array("letter" => 'c', "number" => 100),
  23.         array("letter" => 'D', "number" => 500),
  24.         array("letter" => 'd', "number" => 500),
  25.         array("letter" => 'M', "number" => 1000),
  26.         array("letter" => 'm', "number" => 1000),
  27.         array("letter" => 0, "number" => 0)
  28.     );
  29.     $arabic = 0;
  30.     $state = 0;
  31.     $sidx = 0;
  32.     $len = strlen($roman);
  33.  
  34.     while ($len >= 0) {
  35.         $i = 0;
  36.         $sidx = $len;
  37.         while ($conv[$i]['number'] > 0) {
  38.             if (strtoupper(@$roman[$sidx]) == $conv[$i]['letter']) {
  39.                 if ($state > $conv[$i]['number']) {
  40.                     $arabic -= $conv[$i]['number'];
  41.                 } else {
  42.                     $arabic += $conv[$i]['number'];
  43.                     $state = $conv[$i]['number'];
  44.                 }
  45.             }
  46.             $i++;
  47.         }
  48.         $len--;
  49.     }
  50.     return($arabic);
  51. }
  52.  
  53.  
  54.  
  55. /**
  56.  * Convert all roman numerals in a string to numbers (case insensitive)
  57.  *
  58.  * @param $str
  59.  */
  60. function ma_roman_to_number_string($str) {
  61.     if (empty($str)) return;
  62.  
  63.     return preg_replace_callback('~\b[IVXLCDMivxlcdm0]+\b~', function($m) {
  64.         return ma_roman2number($m[0]);
  65.     }, $str);
  66. }
  67.  
  68.  
  69.  
  70.  
  71. $str = "This is iv chapter of book Hero and a preview of pageX";
  72. echo ma_roman_to_number_string($str);
  73.  
  74.  
  75.  
Success #stdin #stdout 0.02s 23692KB
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This is 4 chapter of book Hero and a preview of pageX
https://ideone.com/oQoh40
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
secret

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