User_Tweets.php

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class User_Tweets extends CI_Controller {

  function __Construct(){
      parent::__Construct();
      $this->load->database(); // load database
      $this->load->model('User_Tweets_Model'); // load model
      $this->load->helper('url');
  }

 public function index() {
   // get posts based on user ID
   $this->data['posts'] = $this->User_Tweets_Model->getPosts(); // calling Post model method getPosts()
   $this->load->view('templates/header', NULL);
   $this->load->view('templates/nav', NULL);
   $this->load->view('user', $this->data); // load the view file , we are passing $data array to view file
   $this->load->view('templates/footer', NULL);
 }

 public function create(){
   $this->load->helper(array('form', 'url'));
   $this->load->library('form_validation');
   $this->form_validation->set_rules('tweet', 'Tweet', 'required');

   if ($this->form_validation->run() === FALSE)
   {
     $this->data['posts'] = $this->User_Tweets_Model->getPosts(); // calling Post model method getPosts()
     $this->load->view('templates/header', NULL);
     $this->load->view('templates/nav');
     $this->load->view('user', $this->data); // load the view file , we are passing $data array to view file
     $this->load->view('templates/footer', NULL);
   }
   else
   {
       $this->User_Tweets_Model->addTweet();
       redirect("/User_Tweets");
   }

 }

 public function logout(){
   $this->load->helper('url');
   $this->session->sess_destroy();
   redirect("/login");
 }

}