convert number to words.

number-to-words.php

<?php 
 
function convert($n) 
{
	$d = array(
		0 =>'zero', 1 => 'one', 2 => 'two', 3=> 'three', 4=> 'four', 5 => 'five', 6=> 'six', 7=> 'seven', 8=> 'eight', 9=> 'nine', 10=> 'ten',
		11 => 'eleven', 12 => 'twelve', 13 => 'thirteen',  14=>'fourteen', 15 => 'fifteen', 16 => 'sixteen', 17 => 'seventeen', 18 => 'eighteen', 19 => 'nineteen',
		20 => 'twenty', 30 => 'thirty', 40 => 'fourty', 50 => 'fifty', 60 => 'sixty', 70 => 'seventy', 80 => 'eighty', 90 => 'ninety',
		100 => 'hundred', 1000 => 'thousand', 1000000 => 'million', 1000000000 => 'billion'
	);
 
	$s = '';
 
	switch (1)
	{
		case $n < 21:
			$s = $d[$n];
			break;
 
		case $n < 100:
			$tens = (int) ($n / 10) * 10;
			$unit = $n % 10;
			$s = $d[$tens];
 
			if($unit)
			{
				$s.= ' '. $d[$unit];
			}
			break;
 
		case $n < 1000:
			$hundreds = ($n / 100);
			$unit = $n % 100;
 
			$s = $d[$hundreds] .' '. $d[100];
 
			if($unit)
			{
				$s.= ' '. convert($unit);
			}
			break;
 
		default:
			$base = pow(1000, floor(log($n, 1000)));
 
			$num_base = (int) ($n / $base);
			$remainder = $n % $base;
 
			$s = convert($num_base) . ' ' . $d[$base];
 
			if ($remainder) {
				$s.= ' '. convert($remainder);
			}
 
			break;
	}
 
	return $s;
}