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Create Your First Controller In Codeigniter

In this article, we will create our first controller in codeigniter.

What Is The Controller?

Controller facilitates the communication between view and model.

Where Do You Find The Controllers?

You can find the controllers file inside the "application/Controllers" folder

Picture showing the folder structure in codeigniter

Click to Enlarge

Create Your First Controller

To create a controller

Create a new file "About.php"
Inside the controller, add the following command

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

class About extends CI_Controller
{
    public function Index()
    {
        $this->load->view('About');
    }
}

It is important to note that controller class name and controller file name should be the same.

As you can see the above screen shot, the controller extends CI_Controller. Inside the controller, add a function "Index". The function returns the view "About".

"About" view is the PHP file inside the "Views" folder.

Click to Enlarge

Once you execute the code, you will get following output

Picture showing the output of controller in the browser

Click to Enlarge

Index Function

In the above screen shot, we have not specified "Index" after "About" in the URL. The reason is, index is the default function of any controller.

Let us rename "Index" to "CallAbout".

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

class About extends CI_Controller
{
    public function CallAbout()
    {
        $this->load->view('About');
    }
}

Now the above URL will give the message "404 - File Not Found".

Picture showing the 404 error message when index function is accessed after renaming it

Click to Enlarge

And this new URL will upload the "about" page

Picture showing the output of controller with function name 'CallAbout'

Click to Enlarge

Posted By -	Karan Gupta

Posted On -	Friday, July 10, 2020

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