Getal omzetten naar letters

<?php
$datenow = date("Y,m,d");
function age($day,$month,$year)
{
  global $datenow;
  $age = date("Y") - $year;
  if(date("m") < $month) {
    $age--;
  }
  elseif(date("m") == $month && date("d") < $day) {
    $age--;
  }
  return $age;
}
echo 'I am '.age('..','..','....').' years old.';
?>

<?php


$datenow = date("Y,m,d");
function age($day,$month,$year)
{
  global $datenow;
  $age = date("Y") - $year;
  if(date("m") < $month) {
    $age--;
  }
  elseif(date("m") == $month && date("d") < $day) {
    $age--;
  }
  return $age;
}


$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);
}






  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));
 }


// Age with the function convertNum
 $age = age("..","..","....");
 echo "I am ".convertNum($age)." years old.";


?>