将未登录的用户重定向到登录页面

Question

I tried many many times... But it does not redirect to anywhere:

<?php
    session_start();
    if (!isset($_SESSION['username'])) {
        header("Location: LogIn.php");
        exit;
    }
    else{
        //Content of the webpage
    }
?>

How can I fix this?

Answer 1

I tested it and it works for me. Be sure not to have any output before the header function. It can also be caused by error_reporting . Try using error_reporting(0); .

Answer 2

Try using an absolute URl like this:

<?php  
    session_start();  
    if (!isset($_SESSION['username'])) {  
        header("Location: http://www.mysite.com/LogIn.php");  
        exit;  
    }  
    else{  
        //Content of the webpage  
    }  
?>

Another thing to try is make sure no headers are being sent first; there will be a visible error if any are on the page.

Answer 3

首先检查session变量是否具有该值并输入if条件， if可以，请尝试在标头中使用完整的url。