How to learn PHP and Codeigniter framework in a month

Superglobals

PHP superglobals means a global variable accessible not only within a functions but more than functions like URL, HTML forms, session, cookies, another functions

List of superglobals
1.  $_GET
2.  $_POST
3.  $_COOKIE
4.  $_REQUEST
5.  $_SESSION
6.  $_SERVER
7.  $_ENV
8.  $_FILES