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Factorial Number Program in PHP

Summary

Simple program to get factorial number of any desired number by user.

The following code makes use of a function and with the help of loops and other variables returns the calculated Factorial value of the number.

Screenshot

Factorial number in PHP Screenshot

Code

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<?
/**
* Function to get Factorial of a Number
* Rohan Sakhale
* 17th March 2012
*/

function getFactorial($num)
{
$fact = 1;
for($i = 1; $i <= $num ;$i++)
$fact = $fact * $i;
return $fact;
}
?>
<!doctype html>
<html>
<head>
<title>Factorial Program in PHP</title>
</head>
<body>
<form action="" method="post">
Enter the number whose factorial requires to be found<br />
<input type="number" name="number" id="number" maxlength="4" autofocus required/>
<input type="submit" name="submit" value="Submit" />
</form>
<?
if(isset($_POST['submit']) and $_POST['submit'] == "Submit")
{
if(isset($_POST['number']) and is_numeric($_POST['number']))
{
echo 'Factorial Number: <strong>'.getFactorial($_POST['number']).'</strong>';
}
else
{
echo 'You need to enter number';
}
}

?>
</body>
</html>