Creating A Calculator

Code

site.phpCopy
<form action="site.php" method="GET">
     Num1: <input type="number" name="num1">
     Num2: <input type="number" name="num2">
     <input type="submit">
</form>

<?php
     $num1 = $_GET["num1"];
     $num2 = $_GET["num2"];
     echo $num1 + $num2;
?>