dtvdz911959
2017-12-05 20:56
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PHP：用户成功注销但在注销刷新主页后显示未定义的变量：

Email is the user session email after successfully logout there is no email exist but on index page is shows undefined index as there is no email after logout.

Notice: Undefined index: email in C:\xampp\htdocs\CMS\index.php on line 9
    <?session_start();
?>
<?php
    require("conection/connect.php");   
    $username=$_SESSION['email'];
    $sel= "select * from users where email= '$username'";
    $run_name = mysqli_query($con, $sel);
    $row_user=mysqli_fetch_array($run_name);
    $name=$row_user['name'];
    $userid=$row_user['user_id'];
    $teacherid=$row_user['teacher_id'];
    $userid=$row_user['stu_id'];
    $usertype=$row_user['type'];
?>

图片转代码服务由CSDN问答提供 功能建议

电子邮件是成功注销后的用户会话电子邮件，不存在电子邮件，但索引页面上显示未定义的索引，因为那里 注销后没有电子邮件。 

 注意：未定义的索引：第9行的C：\ xampp \ htdocs \ CMS \ index.php中的电子邮件
＆lt;？session_start（）  ; 
？＆gt; 
＆lt;？php 
 require（“conection / connect.php”）;  
 $ username = $ _ SESSION ['email']; 
 $ sel =“select * from users where email ='$ username'”; 
 $ run_name = mysqli_query（$ con，$ sel）; 
 $ row_user  = mysqli_fetch_array（$ run_name）; 
 $ name = $ row_user ['name']; 
 $ userid = $ row_user ['user_id']; 
 $ teacherid = $ row_user ['teacher_id']; 
 $ userid  = $ row_user ['stu_id']; 
 $ usertype = $ row_user ['type']; 
？＆gt;
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