function getFactoril

<?php

function getFactorial($number)

{

    $fn = 1;

    for($i = 1; $i <= $number; $i++)

        $fn = $fn * $i;

    return $fn;

}

if(isset($_POST['submit'])){

$fn = $_POST['factorial'];

echo "<h1>Factorial Number of  $fn  =" . getFactorial($fn) . "</h1>";

}

else{

echo "<h3>Nothing Found ! Please Input Number To Calculate Factorial</h3>"