*** Use case ***
Using this class is very simple, after you have included it, you have to call only
$smngr = SessionManager::get_instance();
to obtain a SessionManager instance and automatically start a new session. If you want to verify if session starts correctly you can use this method
$smngr->is_started();
You can manipulate registered variables using this method
$smngr->var_is_registered("foo");
$smngr->register_var("foo","foo");
$smngr->get_var("foo");
$smngr->unregister_var("foo");
to clear all variables, just call
$smngr->clear();
*** Protection Mode ***
Protection mode is an easy way to ensure that some code run only after a condition is verified, for example a page that require a valid login. In this case, if user has submitted a valid login information you can use
$smngr->start_protection()
Now, in all pages that require a valid login, call
$smngr->is_protected()
to verify the condition. you can pass a url (e.g. "http://www.google.it") as parameter to is_protected() function if you want to force url redirection in case of test fail.
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