CodeIgniter

 CodeIgniter Server Requirements

• PHP version 5.1.6 or newer.
• A Database is required for most web application programming. Current supported databases are MySQL (4.1+), MySQLi, MS SQL, Postgres, Oracle, SQLite, and ODBC.

CodeIgniter Installation Instructions

• Unzip the package
• Upload the CodeIgniter folders and files to your server. Normally the index.php file will be at your root.
• Open the application/config/config.php file with a text editor and set your base URL. If you intend to use encryption or sessions, set your encryption key. 
• Open the application/config/database.php file with a text editor and set your database settings. 

How to enable arbitrary URL parameters on CodeIgniter

Google adwords isn't being recognized within google analytics, Because by default CodeIgniter will not support parameters in url.
 
Need changes in you config file like below.
$_SERVER['PATH_INFO'] = $_SERVER['ORIG_PATH_INFO'];

$config['uri_protocol'] = 'PATH_INFO';