Custom session variables in Drupal 7 - php

Question

I'm trying to make a custom form in Drupal. This form call a web service and will receive some Json. in this Json response, I have three information (or an error) :
1. User name
2. User language
3. User custom Token (special for another webapp)
Those three info must be placed in session (or anything else) and will be shown in some webpages.
In example, on every page, It will be written "Hello Mr John", and on some web pages I want to show a icon + link with the custom Token to access to another web application, ...
We already have a lots of users, and we don't want to have all the users in the drupal DB.
How can I Do? I'm using Drupal 7
Thanks in advance

Answer 1

I wrote this function to deal with session in Drupal
function _mySite_session($key, $value = NULL)
{
static $storage;
if ($value)
{
$storage[$key] = $value ;
$_SESSION['mykey'][$key] = $value ; // I use 'mykey' as a session key because in case some other module uses 'type' in $_SESSION. So try to make it unique.
}
elseif (empty($storage[$key]) && isset($_SESSION['mykey'][$key]))
{
$storage[$key] = $_SESSION['mykey'][$key];
}
return $storage[$key];
}
To set a session variable:
_mySite_session("USERNAME", "Mr. John");
And to retrieve the value of the session variable:
$username = _mySite_session("USERNAME");