Counter

gistfile1.php

class Counter {
    private $counter = 0;

    public function getCounter()
    {
        return $this->counter;
    }

    public function incrementCounter()
    {
        $this->counter++;
    }
}

class GlobalCounter {
    public static $counter;

    public function __callStatic($name, $args) 
    {
        return call_user_func_array(array(self::$counter, $name), $args);
    }
}
GlobalCounter::$counter = new Counter();