Part 4 - Session in PHP | File Uploading | Super Global Variables

A session is used to save huge amount of data, that is saved in the server
to work with sessions, we have to start the session

session_start()
By using this method, we can start the session
if we want to create a session, access session, delete session, we have to start the session
These variables are available with in the entaire project. The variables which we delcared in one file, we can access them in another file
In PHP, All the Super Global Variables are predefined
All Super Global Variables are array Data type
All Super Global Variables are Associative array.