$this->user->login($username, $password);
Login an admin user to their admin account.
$this->user->logout();
Log an admin user out of their account.
$this->user->hasPermission($key, $value);
Checks to see if the logged in user has permission to view or edit a particular admin page.
$this->user->isLogged();
Checks to see if the admin user is logged into their account.
$this->user->getId();
Gets the ID number of the administrator account.
$this->user->getUserName();
Returns the username of the logged in administrator.