CodeIgniter: From Zero to Blog in 15 minutes

This is a guide on using CodeIgniter to create a MVC application, using a blog as the basic lesson

Transcript

1. http://www.weatheredwatcher.com Coding a (basic) blog in CodeIgniter
2. http://www.weatheredwatcher.com We are making a few assumptions: • You already have a LAMP stack setup • You are somewhat familiar with PHP
3. MVC • Model • View • Controller
4. Model • The Model is a class based representation of the Data. • Contains Methods for dealing with the data • In CodeIgniter it is optional • But why?
5. Model class Blog_model extends CI_Model { function __construct() { parent::__construct(); } }
6. Model function get_last_ten_entries() { $this->db->order_by('timestamp', 'desc'); $query = $this->db->get('blog', 10); return $query->result(); }
7. Model function insert_entry() { $this->title = $this->input->post('title'); $this->entry = $this->input->post('entry'); $this->db->insert('blog', $this); }
8. Controller • The Controller is what passes data between the view and the model • It is a class based representation of your site • Controllers contain methods for dealing with each page. • Not all methods will display a page!
9. Controller class Blog extends CI_Controller { function __construct() { parent::__construct(); }
10. Controller function index() { $this->load->model('Blog_model', 'blog'); $data["results"] = $this->blog->get_last_ten_entries(); $this->load->view('blog_view', $data); }
11. Controller function add() { $this->load->view('blog_new'); } function insert_page(){ $this->load->model('Blog_model', 'blog'); $this->blog->insert_entry(); echo('<h2>Blog entry added..thanks!</h2>'); }
12. View • The view is the part of the application that the user sees • It is a graphical presentation layer
13. View <div id="container"> <h1>Welcome to Our Blog</h1> <div id="body"> <?php foreach($results as $entry): ?> <h3><?=$entry->title; ?></h3> <?=$entry->entry; ?> <?php endforeach; ?> </div> </div>