This is TwitterOAuth PHP library by Abraham Williams slightly changed for Codeigniter integration as library.
More information about Codeigniter libraries available on Codeigniter Documentation.
There are two ways to load library to Codeigniter. Automatically within ./config/autoload.php or directly in your controller by adding this line:
$this->load->library('twitteroauth');
Create an instance:
$connection = $this->twitteroauth->create($consumer, $consumer_secret, $access_token, $access_token_secret);
Verify your authentication details:
$content = $connection->get('account/verify_credentials');
Send a message:
$data = array(
'status' => $message,
'in_reply_to_status_id' => $in_reply_to
);
$result = $connection->post('statuses/update', $data);
More information about Twitter API methods available on Twitter Developer Page.
In addition there is sample authentication controller in the repository. Please refer to controller directory.
Library related issues should be send to official issue tracker.
Any other questions are welcome here.