Re: [PHP] number to word converter

[Hugh Bothwell]

Here is a slightly more readable number-to-English converter.  It will deal
with negative numbers and recognizes zero; it's table-driven, so it
shouldn't be too hard to convert to other languages.

It will convert anything in +/- 10^30.  This should be pretty comprehensive;
if not, extend the triplets table (and email me to explain what on Earth
you're doing with it!! ;-)

<?php

// Hugh Bothwell  [EMAIL PROTECTED]
// August 31 2001
// Number-to-word converter

$ones = array(
 "",
 " one",
 " two",
 " three",
 " four",
 " five",
 " six",
 " seven",
 " eight",
 " nine",
 " ten",
 " eleven",
 " twelve",
 " thirteen",
 " fourteen",
 " fifteen",
 " sixteen",
 " seventeen",
 " eighteen",
 " nineteen"
);

$tens = array(
 "",
 "",
 " twenty",
 " thirty",
 " forty",
 " fifty",
 " sixty",
 " seventy",
 " eighty",
 " ninety"
);

$triplets = array(
 "",
 " thousand",
 " million",
 " billion",
 " trillion",
 " quadrillion",
 " quintillion",
 " sextillion",
 " septillion",
 " octillion",
 " nonillion"
);

 // recursive fn, converts three digits per pass
 function convertTri($num, $tri) {
  global $ones, $tens, $triplets;

  // chunk the number, ...rxyy
  $r = (int) ($num / 1000);
  $x = ($num / 100) % 10;
  $y = $num % 100;

  // init the output string
  $str = "";

  // do hundreds
  if ($x > 0)
   $str = $ones[$x] . " hundred";

  // do ones and tens
  if ($y < 20)
   $str .= $ones[$y];
  else
   $str .= $tens[(int) ($y / 10)] . $ones[$y % 10];

  // add triplet modifier only if there
  // is some output to be modified...
  if ($str != "")
   $str .= $triplets[$tri];

  // continue recursing?
  if ($r > 0)
   return convertTri($r, $tri+1).$str;
  else
   return $str;
 }

// returns the number as an anglicized string
function convertNum($num) {
 $num = (int) $num;    // make sure it's an integer

 if ($num < 0)
  return "negative".convertTri(-$num, 0);

 if ($num == 0)
  return "zero";

 return convertTri($num, 0);
}

?>

and a test fn I wrote,

<?php
  function randThousand() {
   return mt_rand(0,999);
  }

 // Returns an integer in -10^9 .. 10^9
 // with log distribution
 function makeLogRand() {
  $sign = mt_rand(0,1)*2 - 1;
  $val = randThousand() * 1000000
   + randThousand() * 1000
   + randThousand();
  $scale = mt_rand(-9,0);

  return $sign * (int) ($val * pow(10.0, $scale));
 }

// example of usage
for ($i = 0; $i < 20; $i++) {
 $num = makeLogRand();
 echo "<br>$num: ".convertNum($num);
}
?>

Usage is simple:
convertNum(integer) returns a string, the value in English.

Hope this helps.





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