Integers to English Conversion (PHP)

talk open source
1

Hey,

I wrote this little script to convert any integer greater than 0, and less than a decillion (10^33, but there are probably php integer limitations).

<?php
function makeNumberEnglish ($number) {
	// Variables
	$phrase = '';
	$number = (string) $number;
	$values = array();
	$words = array();

	// Fill integers array
	for ($i=strlen($number)-1; $i>=0; $i-=3) {
		$values[pow(10,strlen($number)-($i+1))] = (int) substr($number,($i>2)?$i-2:0,($i>2)?3:$i+1);
	}

	// Places and replacements (backwards to catch largest first)
	$places = array_reverse ( array	(
		1, 1000, 1000000, 1000000000, 1000000000000, 1000000000000000, 1000000000000000000,
		1000000000000000000000, 1000000000000000000000000, 1000000000000000000000000000,
		1000000000000000000000000000000
	) );
	$placeReplacements = array_reverse ( array (
		'', 'thousand', 'million', 'billion', 'trillion','quadrillion','quintillion','sextillion',
		'septillion','octillion','nonillion'
	) );
	foreach ($values as $place => $numeral ) {
		$placeWord = str_replace($places,$placeReplacements,(int) $place);
		if ($numeral!=0) {
			$words[$place] = makeHundredsString($numeral) . ' ' . $placeWord;
		}
	}
	
	$words = array_reverse($words);
	$phrase = array_shift($words);
	foreach ($words as $word) {
		if ($word!='') {
			$phrase .= ', '.$word;
		}
	}
	
	return $phrase;
}

function makeHundredsString ($number) {
	if ($number >= 1000 || $number < 0) // Get rid of invalid calls
		die ('makeHundredsString() may not recieve a number greater than or equal to 1,000, or less than 0.');

	$words = array(); // Hold words to be concatinated
	$phrase = ""; // String to concatinate words to
	$number = str_pad((string) $number, 3, '0', STR_PAD_LEFT);
	$numString = (string) $number;
	
	$digits = array ('', 'one','two','three','four','five','six','seven','eight','nine');
	$tens = array ('','ten','twenty','thirty','forty','fifty','sixty','seventy','eighty','ninety');
	$teens = array ('ten','eleven','twelve','thirteen','fourteen','fifteen','sixteen','seventeen','eighteen','nineteen');
	for ($i=0;$i<3;$i++) {
		$words[] = ($i==1)?$tens[$numString{$i}]:$digits[$numString{$i}];
	}

	if ($words[1] == 'ten') {
		$words[2] = $teens[$numString{2}];
		$words[1] = '';
	}

	// Make sure it is very natural
	$phrase =	(($words[0]=='')?null:$words[0].' hundred '). 
					// If number has hundreds place, add it
				(($words[0]!=''&&($words[1]!='' || $words[2]!=''))?'and ':null).$words[1].	
					// If number had a hundreds place, and has either ones or tens too
				(($words[2]=='')?null:(($words[1]!='')?'-':null).$words[2]);
					// If number is not blank: if tens place is not blank, then put dash, 
					// else null, then concatinate ones place
	
	return $phrase;
}
?>

Execute it using something like this:

<?=makeNumberEnglish(522);?>

In a minute, I’ll try making an html form for y’all to test it out without running it yourself.