stupid.php

<?
class Response
{
        private $headers = array();
        private $body = '';

        function __construct($body='', $headers=array())
        {
                $this->body = $body;
                $this->headers = array_merge($this->headers, $headers);
        }

        public function __isset($key)
        {
                return in_array($key, array('headers', 'body'));
        }

        public function __get($key)
        {
                if (isset($this->{$key})) {
                        return $this->{$key};
                }
        }

        public function __set($key, $value)
        {
                if (isset($this->{$key})) {
                        $this->{$key} = $value;
                }
        }
}

$resp = new Response();
$resp->headers[] = 'Content-Type: text/javascript'; // did not work!
$resp->headers = array(1,2,3); // work!
$resp->headers[] = 4;  // did not work!!

?>