这句语句有问题吗，有的话请指出来

Question

session_start();
header('cuntent-type:text/html');
if(isset($_SESSION['usename']) && $_SESSION['usename']==='lunan'){
 exit('已经登录，请勿重复登录') ;
}
if(isset($_POST['submit'])){
 if(isset($_POST['usename'])&&isset($_POST['password'])&&$_POST['usename']==='lunan'&&$_POST['password']==='123'){
   $_SESSION['usename']=$_POST['usename'];
   header('location:240.php?info=登录成功');
  }else{
   echo 'cookie设置失败';
  }
 } else{
  header('location:241.php?url=240.php&info=abc');
 }
}

Answer 1

session_start();开启session...但是你没有结束session_write_close();//关闭session  起到真实保存   而且防止session阻塞有开就有关..记住