class model {

        private $arrValues = array();

        public function __get($var) {
                return $this->arrValues[$var];
        }

        public function __set($var, $val) {
                $this->arrValues[$var] = $val;
        }

}

class contrlr implements SplOberver, SplSubject {

        private $objModel;

        public function __construct( model $objModel ) {
                $this->objModel = $objModel;
        }

        public function parsePost( array $arrPost ) {
                foreach ( $arrPost as $key => $value ) {
                        $this->objModel->$key = $value;
                }
        }

        public function update() {
        }

        public function attach() {
        }

        public function detach() {
        }

}

class view implements SplObserver {

    private $strHtml;

    public function getHtml() {
        return $this->strHtml;
    }
}

class Observer implements SplObserver {

    function update(SplSubject $subject) {
        echo "notified: " . $subject->status . "n";
        }

    }

class Subject implements SplSubject {
    private $status;
    private $observer;

    function __construct(SplObserver $observer) {
        $this->attach($observer);
        }

    function __destruct() {
        $this->detach($this->observer);
        }

    function __get($prop) {
        return $this->$prop;
        }

    function __set($prop, $val) {
        $this->$prop = $val;
        $this->notify();
        }

    function notify() {
        $this->observer->update($this);
        }

    function attach(SplObserver $observer) {
        $this->observer = $observer;
        $this->__set("status", "attaching");
        }

    function detach(SplObserver $observer) {
        $this->__set("status", "detaching");
        $this->observer = null;
        }

    }


$observer = new Observer();
$sub1 = new Subject($observer);
$sub1->status = "testing";
$sub2 = new Subject($observer);
unset($sub2);
$sub1->status = "testing again";

abstract class SubjectObserver {
    protected $observer_list = array(); // assoc array of classname=>object
    public $status;

    function update(SubjectObserver $subject) {
        echo get_class($this) . " notified by " . get_class($subject) . ": " . $subject->status . "n";
        }

    function __destruct() {
        foreach ($this->observer_list as $observer)
            { $this->detach($observer); }
        }

    function notify() {
        $args = func_get_args();
        foreach ($args as $arg)
            { $this->observer_list[get_class($arg)]->update($this); }
        }

    function attach() {
        $args = func_get_args();
        foreach ($args as $arg) {
            $this->observer_list[get_class($arg)] = $arg;
            $this->status = "attaching " . get_class($arg);
            $this->notify($arg);
            }
        }

    function detach() {
        $args = func_get_args();
        foreach ($args as $arg) {
            $this->status = "detaching " . get_class($arg);
            $this->notify($arg);
            unset($this->observer_list[get_class($arg)]);
            }
        }

    }

class model extends SubjectObserver {}

class view extends SubjectObserver {}

class controller extends SubjectObserver {}

// initialize
$model = new model();
$view = new view();
$controller = new controller();

$model->attach($controller, $view);
$view->attach($controller, $model);
$controller->attach($model, $view);


// process some input
$controller->status = "input received";
$controller->notify($model);
$model->status = "data filtered";
$model->notify($controller, $view);