PHPで報告されたエラーの理由を教えてください。
次のエラーが報告されます。これは何を意味しますか?
Warning: The magic method __get() must have public visibility and cannot be static in D:\xampp\htdocs\class\Page.php on line 41<br /> <br /> Notice: A session had already been started - ignoring session_start() in D:\xampp\htdocs\index.php on line 13<br /> <br /> Notice: Use of undefined constant g_S_name - assumed 'g_S_name' in D:\xampp\htdocs\index.php on line 14<br /> <br /> Notice: Undefined index: g_S_name in D:\xampp\htdocs\index.php on line 14