Session

Session is a replacement class for the $_SESSION array. Obviously, the superglobal is still being used, but the variables are controlled through this class.

First pull the singleton

$session = Session::singleton();

Now setting and getting variables is simple:

$session->foo = 'bar';

echo $session->foo; // echoes bar

The Session class is using overloading. So _set and _get are controlling the setting and getting. You can also use isset and unset like so:

if (isset($session->foo)) {
     echo 'Foo is here!';
}

unset($session->foo);

If a session variable is not set (or unset) and get is called on it an exception will be thrown.