代码控制php会话代码运行一直提示我第23行有错误session_start();//开始会话if (isset($_POST['userid'])&&isset($_POST['password'])){//使用者尝试登录$userid=$_POST['userid'];$password=$_POST['password'];$db_conn=new mysqli('localhost','root','','auth');if(mysqli_connect_errno()){echo 'Connection to database failed:'.mysqli_connect_error();exit();}$query='select * from authorised_users'."where name='$userid'"."and password='$password'";立即学习“PHP免费学习笔记（深入）”；$result=$db_conn->query($query);if ($result->num_rows >0) {$_SESSION['valid_user']=$userid;}$db_conn->close();}?>home pageif(isset($_SESSION['valid_user'])){echo 'you are logged in as'.$_SESSION['valid_user'].'';echo 'log out';}else{if (isset($userid)){echo 'Could not log you in.';}else{echo 'you are not logged in';}echo'';echo'';echo'Userid:';echo'';echo'password:';echo'';echo'';echo'';echo'';}?>Members section
代码-自学PHP mysql web开发小次鸟，寻求大神帮助 第23章会话控制
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