additional_plugins/serendipity_event_oembed/oembed/OEmbed.class.php

<?php
class OEmbed{
    public $type;
    public $version;
    public $title;
    public $author_name;
    public $author_url;
    public $provider_name;
    public $provider_url;
    public $cache_age;
    public $description; // added by me, not part of OEmbed
    public $resource_url; // added by me, not part of OEmbed
    public $thumbnail_url;
    public $thumbnail_width;
    public $thumbnail_height;

    public function cloneObj($object){
        foreach($object as $key=>$value){
            $this->$key=(string)$value;
        }
    }
}