/**
* Registers a function to be called on auth session expiry
*
* This function will be called when the user's session expires.
* It might be used to reshow a login screen.
*
* @param mixed $handler function or an array of class=>method
*
* @return null
*/
public static function registerExpiredHandler($handler)
{
if (is_callable($handler)) {
self::$_expiredHandler = $handler;
} else {
Nexista_Error::init('Auth Expiry Handler Error', NX_ERROR_FATAL);
}
}
