<?php

class foo {
    static $bar = array();

    public function __set($a, $b) {
        self::$bar[] = $b;
    }

    public function __get($a) {
        /* last */
        return self::$bar[count(self::$bar)-1];
    }
}

function test() {
    return new foo;
}

$a = test()->bar = 1;
var_dump($a, count(foo::$bar), test()->whatever);

print "\n";

$a = test()->bar = NULL;
var_dump($a, count(foo::$bar), test()->whatever);

print "\n";

$a = test()->bar = test();
var_dump($a, count(foo::$bar), test()->whatever);

print "\n";

?>