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$ _SERVER [HTTP_HOST]是重定向问题的原因吗?

[英]Is $_SERVER[HTTP_HOST] the cause of redirect issues?

我启用了虚荣网址(user.domain.com)。 当会话过期或有人清除cookie时,页面将被重定向到具有登录页面的user.domain.com。 所以,在我使用以下代码的所有页面上:

 if(!isset($_SESSION['user_name'])) { header("Location: http://$_SERVER[HTTP_HOST]");}

10次​​中的2次我收到重定向错误,指出该页面重定向次数过多。

这可能是原因吗? 如果我能做的是以不会导致此类问题的方式重定向。

谢谢。

登录代码:

<?php

 session_start(); 



  // Process the POST variables
  $username = $_SESSION["user_name"];
   //$password = $_POST["password"];


  // Set up the session variables
  $_SESSION["user_name"] = $username;

   $ugData = $_REQUEST['sub_name'];

 if($_POST){
  $_SESSION['user_name']=$_POST["user_name"];
  $_SESSION['password']=$_POST["password"];  
   }



   $secret = $info['password'];

//Checks if there is a login cookie

   if(isset($_COOKIE['ID_my_site']))


   //if there is, it logs you in and directes you to the members page

           { 
      $username = $_COOKIE['ID_my_site']; 

      $pass = $_COOKIE['Key_my_site'];

    $check = mysql_query("SELECT user_name, password FROM accounts WHERE user_name = '$username' and sub_name='$ugData'")or die(mysql_error());

while($info = mysql_fetch_array( $check )) 



    {

        if (@ $info['password'] != $pass) 
        {

                    }

    else

        {

        header("Location: home.php");



        }

    }

        }


       //if the login form is submitted 

       if (isset($_POST['submit'])) { // if form has been submitted



           // makes sure they filled it in

        if(!$_POST['user_name'] | !$_POST['password']) {

          die('You did not fill in a required field.');

            }

            // checks it against the database



          if (!get_magic_quotes_gpc()) {

    $_POST['user_name'] = addslashes($_POST['user_name']);


              }

$check = mysql_query("SELECT user_name,password FROM accounts 
    WHERE user_name = '".$_POST['user_name']."' 
    and sub_name='".$ugData."'")or die(mysql_error());



      //Gives error if user dosen't exist

      $check2 = mysql_num_rows($check);

         if ($check2 == 0) {

     die('That user does not exist in our database. 
           <a href=add.php>Click Here to Register</a>');

            }

           while($info = mysql_fetch_array( $check ))   

           {

        $_POST['password'] = md5($_POST['password']);
        $_POST['password'] = $_POST['password'];



      //gives error if the password is wrong



         if (@ $_POST['password'] != $info['password']) {

        die('Incorrect password, please try again');


                }

             else 

          { 


           // if login is ok then we add a cookie 

             $_POST['user_name'] = stripslashes($_POST['user_name']); 

              $hour = time() + 3600; 

                 setcookie(ID_my_site, $_POST['user_name'], $hour); 

                setcookie(Key_my_site, $_POST['password'], $hour);   



             //then redirect them to the members area 

        header("Location: home.php"); 

           } 

            } 

           } 

      else 

           {     





          ?> 

假设重定向到http://yourserver/意味着http://yourserver/index.php ,那么你应该改变if to read

if(!isset($_SESSION['user_name']) && $_SERVER['PHP_SELF'] != '/index.php')
{
    header("Location: http://$_SERVER[HTTP_HOST]");
}

这将避免无休止的重定向。

header("Location: http://{$_SERVER['HTTP_HOST']}"); 这不是问题。

但是,如果您确实在登录页面上有该代码,那么您只需将自己重定向到主页,因为您将无法登录。

如果用户在登录页面上,请确保不重定向用户。

编辑:尝试header('Location: /'); 也许你有一些奇怪的服务器问题,导致$_SERVER['HTTP_HOST']有时会为空。

尝试使用die():

if(!isset($_SESSION['user_name'])) { header("Location: http://user.domain.com"); die();}

如果url从用户更改为用户首先从db获取用户名,并在重定向中使用它。 尝试类似的东西:

...
$username = $row["username"];
...

并使用它:

if(!isset($_SESSION['user_name'])) { header("Location: http://".$username.".domain.com"); die();}

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