Created
September 13, 2014 07:54
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| 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 $negative . convert_number_to_words(abs($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 .= $conjunction . convert_number_to_words($remainder); | |
| } | |
| break; | |
| default: | |
| $baseUnit = pow(1000, floor(log($number, 1000))); | |
| $numBaseUnits = (int) ($number / $baseUnit); | |
| $remainder = $number % $baseUnit; | |
| $string = convert_number_to_words($numBaseUnits) . ' ' . $dictionary[$baseUnit]; | |
| if ($remainder) { | |
| $string .= $remainder < 100 ? $conjunction : $separator; | |
| $string .= convert_number_to_words($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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