We are creating custom helper controller.

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

class Custom_Helper_Controller extends CI_Controller
{

    public function index()
    {
        $array = array('name'=>'krishna','course'=>'B.Tech');
        $this->load->helper('text_helper');

        p($array);
        // echo "<pre>";
        // print_r($array);
        
    }



}

We creating file download controller.

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

class FileDownloadController extends CI_Controller{

    public function index()
	{
        $this->load->helper('download');
        $data = 'Here is some text!';
        $name = 'mytext.txt';
        force_download($name, $data);

       

	}

    
		
}

We creating home controller that load a view as home.

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

class HomeController extends CI_Controller{

    public function index()
	{
		$this->load->view('home');
	}

    
		
}

We creating inserting data controller that inserting data of array into table.

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

class Inserting_Data_Insert_Query_Controller extends CI_Controller
{

    public function index()
    {
        $data = array(
            'title' => 'My title',
            'name' => 'My Name',
            'date' => 'My date'
        );

        $this->db->insert('mytable', $data);
        // Produces: INSERT INTO mytable (title, name, date) VALUES ('My title', 'My name', 'My date')

    }



}

We creating inserting data with object controller that inserting data of object into database table.

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

class Inserting_Data_Insert_Query_Using_Object_Controller extends CI_Controller
{

    public function index()
    {
        /*
        class Myclass {
              public $title = 'My Title';
              public $content = 'My Content';
              public $date = 'My Date';
         }
        */

        $object = new Myclass;
        $this->db->insert('mytable', $object);
        // Produces: INSERT INTO mytable (title, content, date) VALUES ('My Title', 'My Content', 'My Date')

    }



}