if($thumbnail=="") { $thumbnail = get_site_url(). "/wp-content/uploads/2019/02/generic-castle.jpg);"; } // generic image
$thumbnail = explode('/',$thumbnail);
$c = count($thumbnail)-1;
$thumbnail[$c] = rawurlencode($thumbnail[$c]);
$thumbnail = implode('/',$thumbnail);
$thumbnail = rtrim($thumbnail, "/");
?>