public static function getInstance() { if (NULL === self::$_instance) { self::$_instance = new Response(); } return self::$_instance; }
public static function getInstance() { if (!isset(self::$_instance)) { self::$_instance = new self(); //self::setHeader( "Cache-Control", "no-store, no-cache, must-revalidate, post-check=0, pre-check=0" ); } return self::$_instance; }