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- public function convert_number_to_words($number)
- {
- $hyphen = '-';
- $conjunction = ' and ';
- $separator = ', ';
- $negative = 'negative ';
- $decimal = ' point ';
- $dictionary = array(
- 0 => 'zero',
- 1 => 'one',
- 2 => 'two',
- 3 => 'three',
- 4 => 'four',
- 5 => 'five',
- 6 => 'six',
- 7 => 'seven',
- 8 => 'eight',
- 9 => 'nine',
- 10 => 'ten',
- 11 => 'eleven',
- 12 => 'twelve',
- 13 => 'thirteen',
- 14 => 'fourteen',
- 15 => 'fifteen',
- 16 => 'sixteen',
- 17 => 'seventeen',
- 18 => 'eighteen',
- 19 => 'nineteen',
- 20 => 'twenty',
- 30 => 'thirty',
- 40 => 'fourty',
- 50 => 'fifty',
- 60 => 'sixty',
- 70 => 'seventy',
- 80 => 'eighty',
- 90 => 'ninety',
- 100 => 'hundred',
- 1000 => 'thousand',
- 1000000 => 'million',
- 1000000000 => 'billion',
- 1000000000000 => 'trillion',
- 1000000000000000 => 'quadrillion',
- 1000000000000000000 => 'quintillion'
- );
- if (!is_numeric($number)) {
- return false;
- }
- if (($number >= 0 && (int) $number < 0) || (int) $number < 0 - PHP_INT_MAX) {
- // overflow
- trigger_error(
- 'convert_number_to_words only accepts numbers between -' . PHP_INT_MAX . ' and ' . PHP_INT_MAX,
- E_USER_WARNING
- );
- return false;
- }
- if ($number < 0) {
- return $negative . $this->convert_number_to_words(abs($number));
- }
- $string = $fraction = null;
- if (strpos($number, '.') !== false) {
- list($number, $fraction) = explode('.', $number);
- }
- switch (true) {
- case $number < 21:
- $string = $dictionary[$number];
- break;
- case $number < 100:
- $tens = ((int) ($number / 10)) * 10;
- $units = $number % 10;
- $string = $dictionary[$tens];
- if ($units) {
- $string .= $hyphen . $dictionary[$units];
- }
- break;
- case $number < 1000:
- $hundreds = $number / 100;
- $remainder = $number % 100;
- $string = $dictionary[$hundreds] . ' ' . $dictionary[100];
- if ($remainder) {
- $string .= $conjunction . $this->convert_number_to_words($remainder);
- }
- break;
- default:
- $baseUnit = pow(1000, floor(log($number, 1000)));
- $numBaseUnits = (int) ($number / $baseUnit);
- $remainder = $number % $baseUnit;
- $string = $this->convert_number_to_words($numBaseUnits) . ' ' . $dictionary[$baseUnit];
- if ($remainder) {
- $string .= $remainder < 100 ? $conjunction : $separator;
- $string .= $this->convert_number_to_words($remainder);
- }
- break;
- }
- if (null !== $fraction && is_numeric($fraction)) {
- $string .= $decimal;
- $words = array();
- foreach (str_split((string) $fraction) as $number) {
- $words[] = $dictionary[$number];
- }
- $string .= implode(' ', $words);
- }
- return $string;
- }
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