<?php

class A {
public $value = 0;
public function __constructor() {
$value = 1;
}
}

class B {
public $value = 0;
public function __constructor() {
$value = 2;
}
}
$a = new A();
$b = new B();

$a->value++;
$b->value--;

$result = $a->value + $b->value;

?>