Question

In PHP, is there an easy way to convert a number to a word? For instance, 27 to twenty-seven.

Answer 1

I found some (2007/2008) source-code online and as it is copyright but I can use it freely and modify it however I want, so I place it here and re-license under CC-Wiki:

<?php /**  * English Number Converter - Collection of PHP functions to convert a number  *                            into English text.  *  * This exact code is licensed under CC-Wiki on Stackoverflow.  * http://creativecommons.org/licenses/by-sa/3.0/  *  * @link     http://stackoverflow.com/q/277569/367456  * @question Is there an easy way to convert a number to a word in PHP?  *  * This file incorporates work covered by the following copyright and  * permission notice:  *  *   Copyright 2007-2008 Brenton Fletcher. http://bloople.net/num2text  *   You can use this freely and modify it however you want.  */  function convertNumber($number) {     list($integer, $fraction) = explode('.', (string) $number);      $output = '';      if ($integer{0} == '-')     {         $output = 'negative ';         $integer    = ltrim($integer, '-');     }     else if ($integer{0} == '+')     {         $output = 'positive ';         $integer    = ltrim($integer, '+');     }      if ($integer{0} == '0')     {         $output .= 'zero';     }     else     {         $integer = str_pad($integer, 36, '0', STR_PAD_LEFT);         $group   = rtrim(chunk_split($integer, 3, ' '), ' ');         $groups  = explode(' ', $group);          $groups2 = array();         foreach ($groups as $g)         {             $groups2[] = convertThreeDigit($g{0}, $g{1}, $g{2});         }          for ($z = 0; $z < count($groups2); $z++)         {             if ($groups2[$z] != '')             {                 $output .= $groups2[$z] . convertGroup(11 - $z) . (                         $z < 11                         && !array_search('', array_slice($groups2, $z + 1, -1))                         && $groups2[11] != ''                         && $groups[11]{0} == '0'                             ? ' and '                             : ', '                     );             }         }          $output = rtrim($output, ', ');     }      if ($fraction > 0)     {         $output .= ' point';         for ($i = 0; $i < strlen($fraction); $i++)         {             $output .= ' ' . convertDigit($fraction{$i});         }     }      return $output; }  function convertGroup($index) {     switch ($index)     {         case 11:             return ' decillion';         case 10:             return ' nonillion';         case 9:             return ' octillion';         case 8:             return ' septillion';         case 7:             return ' sextillion';         case 6:             return ' quintrillion';         case 5:             return ' quadrillion';         case 4:             return ' trillion';         case 3:             return ' billion';         case 2:             return ' million';         case 1:             return ' thousand';         case 0:             return '';     } }  function convertThreeDigit($digit1, $digit2, $digit3) {     $buffer = '';      if ($digit1 == '0' && $digit2 == '0' && $digit3 == '0')     {         return '';     }      if ($digit1 != '0')     {         $buffer .= convertDigit($digit1) . ' hundred';         if ($digit2 != '0' || $digit3 != '0')         {             $buffer .= ' and ';         }     }      if ($digit2 != '0')     {         $buffer .= convertTwoDigit($digit2, $digit3);     }     else if ($digit3 != '0')     {         $buffer .= convertDigit($digit3);     }      return $buffer; }  function convertTwoDigit($digit1, $digit2) {     if ($digit2 == '0')     {         switch ($digit1)         {             case '1':                 return 'ten';             case '2':                 return 'twenty';             case '3':                 return 'thirty';             case '4':                 return 'forty';             case '5':                 return 'fifty';             case '6':                 return 'sixty';             case '7':                 return 'seventy';             case '8':                 return 'eighty';             case '9':                 return 'ninety';         }     } else if ($digit1 == '1')     {         switch ($digit2)         {             case '1':                 return 'eleven';             case '2':                 return 'twelve';             case '3':                 return 'thirteen';             case '4':                 return 'fourteen';             case '5':                 return 'fifteen';             case '6':                 return 'sixteen';             case '7':                 return 'seventeen';             case '8':                 return 'eighteen';             case '9':                 return 'nineteen';         }     } else     {         $temp = convertDigit($digit2);         switch ($digit1)         {             case '2':                 return 'twenty-$temp';             case '3':                 return 'thirty-$temp';             case '4':                 return 'forty-$temp';             case '5':                 return 'fifty-$temp';             case '6':                 return 'sixty-$temp';             case '7':                 return 'seventy-$temp';             case '8':                 return 'eighty-$temp';             case '9':                 return 'ninety-$temp';         }     } }  function convertDigit($digit) {     switch ($digit)     {         case '0':             return 'zero';         case '1':             return 'one';         case '2':             return 'two';         case '3':             return 'three';         case '4':             return 'four';         case '5':             return 'five';         case '6':             return 'six';         case '7':             return 'seven';         case '8':             return 'eight';         case '9':             return 'nine';     } }