MVC Standards for Model-View-Controller. It is a architectural pattern that divides the system into three main parts.
- The model deals with database communication .
- The controller directs the functions between the model and the view.
- View is responsible for data presentation.
How MVC frameworks work?
The following image shows the MVC framework works
CodeIgniter Controller
Open the file Welcome.php controller located application/controllers
application/controllers /Welcome.php
<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class Welcome extends CI_Controller {
public function index() {
$this->load->view('welcome_message');
}
}
- defined('BASEPATH') OR exit('No direct script access allowed'); prevents direct access to the controller
- Welcome controller class and extends the parent class CI_Controller
- index method that responds to the URL
$this->load->view('welcome_message'); loads the view welcome_message that is located in application/views directory
CodeIgniter Views
application/views/welcome_message.php
<?php
defined('BASEPATH') OR exit('No direct script access allowed');?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Welcome to CodeIgniter</title>
</head>
<body>
<div id="container">
<h1>Welcome to CodeIgniter!</h1>
</div>
</body>
</html>
Run the application
http://localhost/project_name/index.php/controller_name/controller_method
Example in my case:
http://localhost/bcit-ci-CodeIgniter-b73eb19/index.php/Welcome/index