我的会话有什么问题？当我重新加载页面时，它说它有一个重定向循环

Question

当我重新加载页面时，它说：此网页有一个重定向循环。我的代码出了什么问题？请有人帮帮我     

$row = mysqli_fetch_assoc(sql);
$login_session = $row['username'];
if(!isset($login_session)){
    mysql_close($connection);
    header("Location: AdminLogin.php");
}
?>

Answer 1

重定向圈时会发生这种情况。

例如：

in index.php the user gets redirected to login.php
in login.php the user gets redirected to register.php
and finaly
in register.php the user gets redirected to index.php again
                                            so that the circle is closed.