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The shutdown event is triggered after the output has been send to the browser and PHP is closing down. It is triggered through a registered shutdown function, and the framework itself uses it to write the session data to the session storage backend.

You add an event using

\Event::register('shutdown', $callback);

where $callback is any valid PHP callback (see http://php.net/manual/en/language.types.callable.php).

Say your controller as a shutdown function called shutdown(), you would use:

\Event::register('shutdown', array($this, 'shutdown'));