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Convert Number into Words in PHP

Convert number into words in PHP

PHP Script

<?php 
function numberTowords($num)
{ 
$ones = array( 
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" 
); 
$tens = array( 
1 => "ten",
2 => "twenty", 
3 => "thirty", 
4 => "forty", 
5 => "fifty", 
6 => "sixty", 
7 => "seventy", 
8 => "eighty", 
9 => "ninety" 
); 
$hundreds = array( 
"hundred", 
"thousand", 
"million", 
"billion", 
"trillion", 
"quadrillion" 
); //limit t quadrillion 
$num = number_format($num,2,".",","); 
$num_arr = explode(".",$num); 
$wholenum = $num_arr[0]; 
$decnum = $num_arr[1]; 
$whole_arr = array_reverse(explode(",",$wholenum)); 
krsort($whole_arr); 
$rettxt = ""; 
foreach($whole_arr as $key => $i){ 
if($i < 20){ 
$rettxt .= $ones[$i]; 
}elseif($i < 100){ 
$rettxt .= $tens[substr($i,0,1)]; 
$rettxt .= " ".$ones[substr($i,1,1)]; 
}else{ 
$rettxt .= $ones[substr($i,0,1)]." ".$hundreds[0]; 
$rettxt .= " ".$tens[substr($i,1,1)]; 
$rettxt .= " ".$ones[substr($i,2,1)]; 
} 
if($key > 0){ 
$rettxt .= " ".$hundreds[$key]." "; 
} 
} 
if($decnum > 0){ 
$rettxt .= " and "; 
if($decnum < 20){ 
$rettxt .= $ones[$decnum]; 
}elseif($decnum < 100){ 
$rettxt .= $tens[substr($decnum,0,1)]; 
$rettxt .= " ".$ones[substr($decnum,1,1)]; 
} 
} 
return $rettxt; 
} 

extract($_POST);
if(isset($convert))
{
echo "<p align='center' style='color:blue'>".numberTowords("$num")."</p>";
}

?>

HTML Form

<html>
	<head>
		<title>Conver Number to Words in PHP</title>
	</head>
	<body>
		<form method="post">
			<table border="1" align="center">
				<tr>
				<td>Enter Your Numbers</td>
				<Td><input type="text" name="num" value="<?php if(isset($num)){echo $num;}?>"/></Td>
				</tr>
				<tr>
				<td colspan="2" align="center">
				<input type="submit" value="Conver Number to Words" name="convert"/>
				</td>
				</tr>
			</table>
		</form>
	</body>
</html>

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