How to setup PDO and SQLite for CodeIgniter (for SQLite and MySQL). This is the `database.php` file in `the application/config` folder

CodeIgniter_PDOSQLiteMySQL.php

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

$active_group = 'default';
$query_builder = TRUE;

// FOR SQLITE
$db['default'] = array(
	'dsn'	=> 'sqlite:[path-to-database-file]',
	'hostname' => 'localhost',
	'username' => '',
	'password' => '',
	'database' => '',
	'dbdriver' => 'pdo',
	'dbprefix' => '',
	'pconnect' => TRUE,
	'db_debug' => (ENVIRONMENT !== 'production'),
	'cache_on' => FALSE,
	'cachedir' => '',
	'char_set' => 'utf8',
	'dbcollat' => 'utf8_general_ci',
	'swap_pre' => '',
	'encrypt' => FALSE,
	'compress' => FALSE,
	'stricton' => FALSE,
	'failover' => array(),
	'save_queries' => TRUE
);

// FOR MYSQL
$db['default'] = array(
	'dsn'	=> 'mysql:host=[host-address];dbname=[db-name]',
	'hostname' => '[host-address]',
	'username' => '[db-username]',
	'password' => '[db-password]',
	'database' => '[db-name]',
	'dbdriver' => 'pdo',
	'dbprefix' => '',
	'pconnect' => TRUE,
	'db_debug' => (ENVIRONMENT !== 'production'),
	'cache_on' => FALSE,
	'cachedir' => '',
	'char_set' => 'utf8',
	'dbcollat' => 'utf8_general_ci',
	'swap_pre' => '',
	'encrypt' => FALSE,
	'compress' => FALSE,
	'stricton' => FALSE,
	'failover' => array(),
	'save_queries' => TRUE
);