how to convert number to text in php example

PHP Code

<?php
     
        function convert_number_to_words($number) 
{
$hyphen      = '-';
$conjunction = ' ';
$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;
}
?>

<?php echo convert_number_to_words(512).' Only';?>

how to convert amount to text in php example