Configuration in CodeIgniter

First we have to set the database connection:

1. Opent the file application/config/database.php.
   
2. $config['hostname'] = "localhost";
   
   $config['username'] = "myusername";
   
   $config['password'] = "mypassword";
   
   $config['database'] = "mydatabase";
   
   $config['dbdriver'] = "mysql";
   
   
   
3. Then open application/config/config.php
   
   $config['base_url'] = 'http://localhost/codeigniter';
   
   $config['encryption_key'] = '1234';
   
   Note:For all process in CI it will look into the index.php as initial file
   
4. Open application/config/autoload.php
   
   $autoload['libraries'] = array('session','database');
   
   and
   
   $autoload['helper'] = array('url','form');