public static function getInstance()
{
if (is_null(self::$_instance)) {
self::$_instance = new self();
}
return self::$_instance;
}
/**
* Allow only one instance of this class exist
* for a single request
*/
public static function instance()
{
$called = get_called_class();
if (self::$instance instanceof self) {
return self::$instance;
}
return self::$instance = new self();
}
public static function getInstance()
{
return self::$_instance ?: (self::$_instance = new self());
}