Is this a good example of how to use a class in PHP ? I have built a basic class that performs addition , substraction, multiplication and division of two numbers ... Below is the code .. I wanna know if I wrote this class properly
<?php

class operation
{
function Add($x,$y)
{
echo "The sum of".$x." and ".$y." is".($x+$y)."<br />";
}
function Sub($x,$y)
{
echo "The difference of".$x." and ".$y." is".($x-$y)."<br />";
}

function Div($x,$y)
{
echo "The Quotient of".$x." and ".$y." is".($x/$y)."<br />";
}
function Pro($x,$y)
{
echo "The Product of".$x." and ".$y." is".($x*$y)."<br />";
}

}

$b = new operation();
$b->Div(10,5);
$b->Pro(10,5);
$b->Add(10,5);
$b->Sub(10,5);



?>