Using external class in my Controller - php

Question

Im working on my first project in CodeIgniter and I wonder How can I use my class from library in my Controller.
libraries/Twitterclass.php:
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Twetterclass {
public function __construct($hashtag, $tweet_id)
{
require_once('TwitterAPIExchange.php');
//There is my working code
//I want to make use of this $n in my Controller
return $n;
}
}
/* End of file Twetterclass.php */
My Controller:
public function microtweets()
{
$params = array('hashtag' => 'somehashtag', 'tweet_id' => '673899616799191040');
$data['count_tweets'] = $this->load->library('Twetterclass', $params);
$this->load->view('tweets', $data);
}
I want to use his extended class in my controller and work there on this $n value or for example display it in my View.
I get few errors:
A PHP Error was encountered
Severity: Warning
Message: Missing argument 2 for Twetterclass::__construct(), called in
/home/jail/kg7dad5/home/kg7dad5/domains/badzlepszy.pl/public_html/coinmonitor/system/core/Loader.php
on line 1246 and defined
Filename: libraries/Twetterclass.php
Line Number: 5
Backtrace:
File: /application/libraries/Twetterclass.php Line: 5 Function:
_error_handler
File: /application/controllers/Cointweet.php Line: 24 Function:
library
File: /public_html/coinmonitor/index.php Line: 292 Function:
require_once

Answer 1

first try to debug parameter you passed in constructor
public function __construct($hashtag, $tweet_id)
{
echo $hashtag;
echo $tweet_id;
die;
}

Answer 2

according to your code, change like this,
public function __construct($arr)
{
echo $arr['hashtag'];
echo $arr['tweet_id'];
exit;
}
Because you are passing 1 array, so access in library with array index.