Quando eu logo no sistema aparece varios erros esse é um deles , notifica que a linha 3 ta errado ou coisa do genero a mensagem é essa : Notice: A session had already been started - ignoring session_start() in C:\xampp\htdocs\controle\admincontrole\status.php on line 3 , Notice: A session had already been started - ignoring session_start() in C:\xampp\htdocs\controle\admincontrole\valida_session.php on line 2 , Notice: Undefined variable: begin in C:\xampp\htdocs\controle\admincontrole\ler_abertos.php on line 53 .