注销时重定向并显示“您已成功注销！”

Question

我在我的网站上有会员服务。目前，当有人登录了，他们将被重定向到logout.php在其上有这样的代码：

<?php 

     //check if the login session does no exist 
     if(strcmp($_SESSION['uid'],”) == 0){ 
      //if it doesn't display an error message 
      echo "<center>You need to be logged in to log out!</center>"; 
     }else{ 
      //if it does continue checking 

      //update to set this users online field to the current time 
      mysql_query("UPDATE `users` SET `online` = '".date('U')."' WHERE `id` = '".$_SESSION['uid']."'"); 

      //destroy all sessions canceling the login session 
      session_destroy(); 

      //display success message 
      echo "<center>You have successfully logged out!<br><a href = '/review-pratt/index.php' class='icon-button star'>Return Home</button></center>"; 
     } 

     ?> 

而不是由用户采取“logout.php”和观看一个无聊的页面，上面写着他们注销的。我希望他们被重定向到index.php。我知道这部分很简单。

我希望横跨顶部的通知栏显示通知他们他们已成功注销。我曾试图做到这一点，从来没有任何工作。任何帮助或建议，将不胜感激！

更新

我已经改变了logout.php代码：

<?php 

     //check if the login session does no exist 
     if(strcmp($_SESSION['uid'],”) == 0){ 
      //if it doesn't display an error message 
      echo "<center>You need to be logged in to log out!</center>"; 
     }else{ 
      //if it does continue checking 

      //update to set this users online field to the current time 
      mysql_query("UPDATE `users` SET `online` = '".date('U')."' WHERE `id` = '".$_SESSION['uid']."'"); 

      //destroy all sessions canceling the login session 
      session_destroy(); 

      //Redirect with success message 
      header('Location: /index.php?msg=' . urlencode("You have been successfully logged out!")); 
     } 

     ?> 

和下面的代码添加到我的index.php：

<?php 

    if ($_GET['msg']) 
{ 
     echo '<div class="success_message">' . base64_decode(urldecode($_GET['msg'])) . '</div>'; 
} 

?> 

当我登录出我收到此错误：

Warning: Cannot modify header information - headers already sent by (output started at /home/content/38/10473938/html/review-pratt/business_profiles/logout.php:19) in /home/content/38/10473938/html/review-pratt/business_profiles/logout.php on line 35 

Answer 1

对此有很多解决方案，但几乎所有的解决方案都需要logout.php来传递消息，而index.php则需要代码来显示消息。

我的首选方法是将消息作为URL参数传递。使用header来重定向，使用base64_encode来缩短url中的文本，并使用url_encode来确保URL不会被取消。

//Redirect with success message 
header('Location: /index.php?msg=' . urlencode(base64_encode("You have been successfully logged out!"))); 

然后，您的index.php页面上

if ($_GET['msg']) 
{ 
     echo '<div class="success_message">' . base64_decode(urldecode($_GET['msg'])) . '</div>'; 
} 

编辑：如果标题已经发出了（？有你echo编了以上这些线路一些文本）你可以使用Javascript来做重定向。

更换header('Location: ')本：echo '<meta http-equiv="Refresh" content="0;url=http://example.com/index.php?msg=' . urlencode(base64_encode('You have been successfully logged out!')) . '">';

Answer 2

你可以做这样的事情：

header('location: index.php?status=loggedout'); 

，并在您的index.php文件只是看看，如果状态不为空，并显示有一个div这样的状态：

<?php 
    if(!empty($_GET['status'])){ 
      echo '<div>You have been logged out!</div>'; 
    } 
?> 

也在里面，如果语句，您可以清除用户会话藏汉..

Answer 3

您可以使用“Noty”插件在您的网络应用上启用通知。 在这里看到：http://needim.github.com/noty/

实施应该是类似的东西：

1. 将用户重定向到的index.php？注销= 1
2. 使用查询字符串参数来填充隐藏字段。
3. 使用noty在页面加载时显示隐藏字段值。

这里是一个代码示例：

<?php 
    if(!empty($_GET['logout'])){ 
      echo '<input id="logoutMsg" value="You have been logged out!" />'; 
    } 
?> 

<script> 
    var logoutMsg = $('#logoutMsg').val(); 
    var noty = noty({text: logoutMsg }); 
</script> 

Answer 4

如果你想重定向成功的消息之后，然后用下面的代码： -

<?php 

     //check if the login session does no exist 
     if(strcmp($_SESSION['uid'],”) == 0){ 
      //if it doesn't display an error message 
      echo "<center>You need to be logged in to log out!</center>"; 
     }else{ 
      //if it does continue checking 

      //update to set this users online field to the current time 
      mysql_query("UPDATE `users` SET `online` = '".date('U')."' WHERE `id` = '".$_SESSION['uid']."'"); 

      //destroy all sessions canceling the login session 
      session_destroy(); 

      //display success message 
      echo "<center>You have successfully logged out! 
      echo '<meta http-equiv="Refresh" content="0;url=http://url.which.you.want.to.be.redirected.to">'; 
} 
     } 
?>