Codeigniter Interview Questions and Answers

• It is an open source framework and free to use.
• It is extremely light weighted.
• It is based on the Model View Controller (MVC) pattern.
• It has full featured database classes and support for several platforms.
• It is extensible. You can easily extend the system by using your libraries, helpers.
• Excellent documentation.

• Please open config.php and change from $config['index_page'] = "index.php" to $config['index_page'] = "";
• Update also from $config['uri_protocol'] ="AUTO"; to $config['uri_protocol'] = "REQUEST_URI";
• Put this code in your htaccess file
  RewriteEngine on
RewriteCond $1 !^(index\.php|resources|robots\.txt)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L,QSA]

How to remove values in session in Codeigniter

unset($_SESSION['username']); // It can be use in core PHP
$this->session->unset_userdata('username'); // It can be done in Codeigniter

If we want to remove more values from session then we can use like this

$this->session->unset_userdata($array);  // $array is defined above. It is an array with key & values.

How to get data from session in Codeigniter

$this->session->userdata('username'); // Here we will get username, if it is exists in session.

• Download it from its download page & then unzip the package.
• Upload its files and folders on your server or localhost.
• Open application/config/config.php file and set base URL.
• If you want to use database then open application/config/database.php file and set your database credientails.
• Now it’s installed

• You have to update your own created controller’s class with $route['404_override'] = 'Controller_Class_Name';. You have to update this in your application/config/routes.php
• Please create your new controller “Controller_Class_Name” file in your controllers directory application/controllers/.
• Please put this code in your Controller_Class_Name.phpclass Controller_Class_Name extends CI_Controller {
  public function __construct() {
  parent::__construct();
  }public function index() {
  $this->output->set_status_header(‘404’);
  $this->load->view(‘error_page_404‘);
  }
  }
• Now create your “error_page_404” view file.