/**
* singleton
*
* Implementation of the singleton pattern. Returns a sincle instance
* of the session class.
*
* @author Joe Stump <*****@*****.**>
* @return mixed Instance of session
*/
public static function singleton()
{
if (!isset(self::$instance)) {
$className = __CLASS__;
self::$instance = new $className();
}
return self::$instance;
}