Codeigniter_Blog_App/application/controllers/Posts.php

<?php
//this controller manipulates thee Posts
class Posts extends CI_Controller
{
    //Displays all the posts
    public function index($offset=0)
    {
        // Pagination Config	
		$config['base_url'] = base_url() . 'posts/index/';
		$config['total_rows'] = $this->db->count_all('posts');
		$config['per_page'] = 3;
		$config['uri_segment'] = 3;
		$config['attributes'] = array('class' => 'pagination-links');

		// Init Pagination
		$this->pagination->initialize($config);

        $data['title'] = 'Latest Posts';
        $data['posts'] = $this->post_model->get_posts(FALSE,$config['per_page'],$offset);

        $this->load->view('templates/header');
        $this->load->view('posts/index', $data);
        $this->load->view('templates/footer');
    }
    
    //Displays each individual post
    public function view($slug = NULL)
    {
        $data['post'] = $this->post_model->get_posts($slug);
        $post_id = $data['post']['id'];
        $data['comments'] = $this->comment_model->get_comments($post_id);

        if (empty($data['post'])) {
            show_404();
        }

        $data['title'] = $data['post']['title'];

        $this->load->view('templates/header');
        $this->load->view('posts/view', $data);
        $this->load->view('templates/footer');

    }

    //Handles the create post
    public function create(){
        //check login
        if(!$this->session->userdata('logged_in')){
            redirect('users/login');
        }

        $data['title'] = 'Create Post';
        $data['categories'] = $this->post_model->get_categories();

        //validations
        $this->form_validation->set_rules('title','Title','required');
        $this->form_validation->set_rules('body','Body','required');

        if($this->form_validation->run() === FALSE)
        {
            $this->load->view('templates/header');
            $this->load->view('posts/create', $data);
            $this->load->view('templates/footer');
        }
        else 
        {
            //Upload Image
            $config['upload_path'] = './assets/images/posts';
            $config['allowed_types'] = 'gif|jpeg|png';
            $config['max_size'] = '2048';
            $config['max_width'] = '2000';
            $config['max_height'] = '2000';

            $this->load->library('upload', $config);

            if(!$this->upload->do_upload('postimage'))
            {
                $errors = array('error' => $this->upload->display_errors());
                $post_image = 'noimage.jpg';
            }
            else
            {
                $data = array('upload_data' => $this->upload->data);
                $post_image = $_FILES['postimage']['name'];
            }

            $this->post_model->create_post($post_image);
            //set flash messages
            $this->session->set_flashdata('post_created','Your post has been created');
            redirect('posts');
        }
    }

    //to delete the post
    public function delete($id){
        //check login
        if(!$this->session->userdata('logged_in')){
            redirect('users/login');
        }

        $this->post_model->delete_post($id);
        $this->session->set_flashdata('post_deleted','Your post has been deleted');
        redirect('posts');
    }

    //function to edit posts
    public function edit($slug){
        //check login
        if(!$this->session->userdata('logged_in')){
            redirect('users/login');
        }

        $data['post'] = $this->post_model->get_posts($slug);

        //Check user
        if($this->session->userdata('user_id') != $this->post_model->get_posts($slug)['user_id']){
            redirect('posts');
        }
        $data['categories'] = $this->post_model->get_categories();

        if (empty($data['post'])) {
            show_404();
        }

        $data['title'] = 'Edit Post';

        $this->load->view('templates/header');
        $this->load->view('posts/edit', $data);
        $this->load->view('templates/footer');
    }

    //function to update posts
    public function update(){
        //check login
        if(!$this->session->userdata('logged_in')){
            redirect('users/login');
        }

        $this->post_model->update_post();
        $this->session->set_flashdata('post_updated','Your post has been updated');
        redirect('posts');
    }

}