<?php

class event implements SplSubject {

        private $storage;

        const PRE_EVENT = 1;
        const POST_EVENT = 2;

        function __construct() {
                $this->storage = new SplObjectStorage();
        }

        public function init()
        {

        }

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

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

        function notify()
        {
                foreach ( $this->storage as $observer )
                {
                        $observer->update( $this );
                }
        }
} // end events class