Write a PHP program that accepts two numbers using a web form and calculates greatest common divisor (GCD) and least common multiple (LCM) of entered numbers.(Use recursive function)

<form method="post">   

    Enter a Number 1: <input type="number" name="t1"><br><br>   

    Enter a Number 2: <input type="number" name="t2"><br><br>   

    <input type="submit" name="submit" value="Submit">   

</form> 

<?php 

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

    $x = $_POST['t1']; 

    $y = $_POST['t2']; 

    function gcd($x, $y)  

    { 

        if ($y == 0) 

            return $x; 

        return gcd($y, $x % $y); 

    }  

    $lcm = ($x * $y) / gcd($x, $y); 

    echo "LCM of $x and $y is: $lcm"; 

}

?>