PHP program to calculate the factorial of a given number using recursion

<?php
//PHP program to calculate the factorial 
//of a given number using recursion.
function fact($num)
{
    if ($num == 1) return 1;

    return $num * fact($num - 1);
}

$result = fact(5);
echo "Factorial is: " . $result;
?>

Output
Factorial is: 120