numberToString.php

<?php

class NumberToString
{
    public static function convertNumber($number)
    {
        $crore = floor($number / 100000000);
        $number -= $crore * 100000000;

        $lakh = floor($number / 1000000);
        $number -= $lakh * 100000;

        $thousand = floor($number / 1000);
        $number -= $thousand * 1000;

        $hundred = floor($number / 100);
        $number -= $hundred * 100;

        $deca = floor($number / 10);
        $n = $number % 10;

        $result = "";
        if ($crore) {
            $result .= static::convertNumber($crore) . " Crore";
        }
        if ($lakh) {
            $result .= (empty($result) ? "" : " ") . static::convertNumber($thousand) . " Lakh";
        }
        if ($thousand) {
            $result .= (empty($result) ? "" : " ") . static::convertNumber($thousand) . " Thousand";
        }
        if ($hundred) {
            $result .= (empty($result) ? "" : " ") . static::convertNumber($hundred) . " Hundred";
        }
        $ones = array("", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eightteen", "Nineteen");
        $tens = array("", "", "Twenty", "Thirty", "Fourty", "Fifty", "Sixty", "Seventy", "Eigthy", "Ninety");
        if ($deca || $n) {
            if (!empty($result)) {
                $result .= " and ";
            }
            if ($deca < 2) {
                $result .= $ones[$deca * 10 + $n];
            } else {
                $result .= $tens[$deca];
                if ($n) {
                    $result .= "-" . $ones[$n];
                }
            }
        }
        if (empty($result)) {
            $result = "zero";
        }
        return $result;
    }

}