<?php
class demo
{
function add($a,$b)
{
$sum=$a+$b;
echo "Sum=".$sum."<br/>";
}
function sub($x,$y)
{
$sub=$x-$y;
echo "Subtraction=".$sub;
}
}
$obj= new demo();
$obj->add($_GET['f'],$_GET['s']);
$obj->sub($_GET['f'],$_GET['s']);
?>
<form>
Enter first number<input type="text" name="f"/><hr/>
Enter second number<input type="text" name="s"/><hr/>
<input type="submit" value="Show result"/>
</form>