$last_number = $_POST['last_number'];
$btn = $_POST['btn'];
if ($btn == '+') {
$result = $obj->addition($first_number, $last_number);
} else {
if ($btn == '-') {
$result = $obj->subtraction($first_number, $last_number);
} else {
if ($btn == '*') {
$result = $obj->multiplication($first_number, $last_number);
} else {
if ($btn == '/') {
$result = $obj->division($first_number, $last_number);
} else {
if ($btn == '%') {
$result = $obj->reminder($first_number, $last_number);
}
}
}
}
}
}
?>
<html>
<head>
<title>PHP OOP Calculator</title>
</head>
<body>
<form action="#" method="post">
<table align="center">
<tr>
