fork(1) download 
  1. <?php
  2.  
  3. function words_to_number($data) {
  4.     // Replace all number words with an equivalent numeric value
  5.     $data = strtr(
  6.         $data,
  7.         array(
  8.             'zero'      => '0',
  9.             'a'         => '1',
  10.             'one'       => '1',
  11.             'two'       => '2',
  12.             'three'     => '3',
  13.             'four'      => '4',
  14.             'five'      => '5',
  15.             'six'       => '6',
  16.             'seven'     => '7',
  17.             'eight'     => '8',
  18.             'nine'      => '9',
  19.             'ten'       => '10',
  20.             'eleven'    => '11',
  21.             'twelve'    => '12',
  22.             'thirteen'  => '13',
  23.             'fourteen'  => '14',
  24.             'fifteen'   => '15',
  25.             'sixteen'   => '16',
  26.             'seventeen' => '17',
  27.             'eighteen'  => '18',
  28.             'nineteen'  => '19',
  29.             'twenty'    => '20',
  30.             'thirty'    => '30',
  31.             'forty'     => '40',
  32.             'fourty'    => '40', // common misspelling
  33.             'fifty'     => '50',
  34.             'sixty'     => '60',
  35.             'seventy'   => '70',
  36.             'eighty'    => '80',
  37.             'ninety'    => '90',
  38.             'hundred'   => '100',
  39.             'thousand'  => '1000',
  40.             'million'   => '1000000',
  41.             'billion'   => '1000000000',
  42.             'and'       => '',
  43.         )
  44.     );
  45.  
  46.     // Coerce all tokens to numbers
  47.     $parts = array_map(
  48.         function ($val) {
  49.             return floatval($val);
  50.         },
  51.         preg_split('/[\s-]+/', $data)
  52.     );
  53.  
  54.     $stack = new SplStack; // Current work stack
  55.     $sum   = 0; // Running total
  56.     $last  = null;
  57.  
  58.     foreach ($parts as $part) {
  59.         if (!$stack->isEmpty()) {
  60.             // We're part way through a phrase
  61.             if ($stack->top() > $part) {
  62.                 // Decreasing step, e.g. from hundreds to ones
  63.                 if ($last >= 1000) {
  64.                     // If we drop from more than 1000 then we've finished the phrase
  65.                     $sum += $stack->pop();
  66.                     // This is the first element of a new phrase
  67.                     $stack->push($part);
  68.                 } else {
  69.                     // Drop down from less than 1000, just addition
  70.                     // e.g. "seventy one" -> "70 1" -> "70 + 1"
  71.                     $stack->push($stack->pop() + $part);
  72.                 }
  73.             } else {
  74.                 // Increasing step, e.g ones to hundreds
  75.                 $stack->push($stack->pop() * $part);
  76.             }
  77.         } else {
  78.             // This is the first element of a new phrase
  79.             $stack->push($part);
  80.         }
  81.  
  82.         // Store the last processed part
  83.         $last = $part;
  84.     }
  85.  
  86.     return $sum + $stack->pop();
  87. }
  88.  
  89. // test
  90. $words = 'five';
  91. echo words_to_number($words);
Success #stdin #stdout 0.02s 23740KB
comments (?)
stdin 
Standard input is empty
stdout 
5
https://ideone.com/InbVjl
language:
PHP (php 7.3.5)
created:
5 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!