How to install CodeIgniter - PHP framework

CodeIgniter is an open-source Web Application framework built in PHP designed to make your life as a programmer easier, while allowing you a good speed for development, and also good performance when the site is up and running.

Easy to install and configure
Clean and elegant MVC implementation
Uses Active Record pattern for database access
Overall small footprint and good performance

Requirements

CodeIgniter framework. Any Apache/PHP/MySQL (Like: LAMP, WAMP, XAMPP). You can install the applications independently, or install one of those packages that have all of them bundled together.

Installing CodeIgniter

Step 1 : Downloading CodeIgniter Framework: Download current version of CodeIgniter framework.

Step 2 : Installing CodeIgniter: To install CodeIgniter, you only need to Unzip the package to the htdocs {OR} www directory of your Web Server.

Step 3 : Configuring CodeIgniter:

Rename the folder for convenience. For example: CodeIgniter

The next step is to Open the application/config/config.php file with text editor and set base URL.

Syntax:

//you can set base URL
$config['base_url'] = "http://localhost/codeigniter/";

Step 4 : Testing CodeIgniter

Then check CodeIgniter application running properly

  http://localhost/codeigniter

Step 5 : Database configuration :

Open the application/config/database.php file with a text editor and configure database

$db['default'] = array(
  'dsn' => '',
  'hostname' => 'localhost',
  'username' => 'root', // Your username if required.
  'password' => '', // Your password if any.
  'database' => 'demo_DB', // Your database name.
  'dbdriver' => 'mysqli',
  'dbprefix' => '',
  'pconnect' => FALSE,
  '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
);

Step 5 :CodeIgniter htaccess and URL rewrite

1- Make below changes in application/config/config.php file

  $config['base_url'] = 'http://'.$_SERVER['SERVER_NAME'].'/Your Ci folder_name';
  $config['index_page'] = '';
  $config['uri_protocol'] = 'AUTO';

2- Make .htaccess file in your root directory using below code

  DirectoryIndex index.php
  RewriteEngine on

  RewriteCond $1 !^(index\.php|(.*)\.swf|forums|images|css|downloads|jquery|js|robots\.txt|favicon\.ico)
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteRule ^(.*)$ ./index.php?$1 [L,QSA]

3- Enable the rewrite engine (if not already enabled)