use of variables in different pages

Hy!

I have created a login for a php application. The user is forced to enter a username and password. This username and password is used to connect to a database. If this is possible the login was successful. Now I want to use this variables ($username, $password) also in other files that belong to this application.
So how am I able to get variables that are defined in other pages of the script? It seems a simple task but I could not really find out searching my manuals!

thanks for help

 

http://www.php.net/manual/en/ref.session.php

 

first file
session_start()
$_SESSION['username']=$username;
$_SESSION['password']=$password;

the following sentence will use in another file.
echo $_SESSION['usernname'];
i am not sure try it

 

Hello!

Thanks a lot for your help! It works great!