Zend Oauth Problems

[selenin]

I try to modify a twitter application, but I have no idea what I'm doing, this is my code so far:

 

    require 'Zend/Oauth/Consumer.php';
    
    
    $token = unserialize($usersClass->twitterToken()); 

		if(!empty($token)) {

		 $client = $token->getHttpClient($config);
             $client->setUri('http://twitter.com/users/profile_image/twitter.json');
         $client->setParameterGet('screen_name', $screen_name);
             $client->setMethod(Zend_Http_Client::GET);
             $response = $client->request();
		}

 

I want to get the twitter profile image, but I think it's too difficult for me...