會話不能正常工作，刷新頁面時會丟失自動會話或內容丟失頁面

Question

我是新來的PHP，在我的學生結果在線系統中完成我的最後一年項目。

在我的系統中，我在會話中出現錯誤，一旦用戶/學生使用他們的用戶名和密碼登錄，儀表板會正確顯示他的詳細信息。

但是，只要頁面重新加載或您點擊查看其他內容或者只是簡單地點擊儀表板內的學生工具欄，該頁面就會丟失其所有相關內容並變爲空閒或空白。

我想防止自動會話破壞或丟失，而用戶仍然在同一頁面上，直到他/她註銷。任何幫助將不勝感激。有趣的是，這些代碼在Localhost（Wamp Server）中運行得非常好，但它在Online（cpanel）中丟失了會話。

我的代碼頁是： 的login.php

<?php 
include('dbcon.php'); 
if (isset($_POST['login'])){ 
    session_start(); 
    $student_no = $_POST['student_no']; 
    $password = $_POST['password']; 
    $query = "SELECT * FROM students WHERE student_no='$student_no' AND password='$password' and status = 'active' "; 
    $result = mysql_query($query)or die(mysql_error()); 
    $num_row = mysql_num_rows($result); 
    $row=mysql_fetch_array($result); 
    if($num_row > 0) { 
     header('location:dasboard.php'); 
     $_SESSION['id']=$row['student_id']; 
    } 
    elae{ 
     header('location:access_denied.php'); 
    } 
} 
?> 

session.php文件

<?php 
session_start(); 
if (!isset($_SESSION['id']) || (trim($_SESSION['id']) == '')) { 
    header("location: index.php"); 
    exit(); 
} 
$session_id=$_SESSION['id']; 
?> 

dasboard.php

<?php include('session.php'); ?> 
<?php include('header.php'); ?> 
<?php include('navbar.php'); ?> 
<?php 
    $query=mysql_query("select * from students where student_id='$session_id'")or die(mysql_error()); 
$row=mysql_fetch_array($query); 
$year_level = $row['year_level']; 
$term = $row['term']; 
$status = $row['student_status']; 
$school_year = $row['year_level'];?> 
<div class="container"> 
<div class="margin-top"> 
<div class="row"> 
<?php include('head.php'); ?> 
<div class="span12"> 
<div class="grade"> 
<?php include('grade_option.php'); ?> 
</div> 
</div> 
<div class="span2"> 
<?php include('user_sidebar.php'); ?> 
</div> 
<div class="span10"> 
<table cellpadding="0" cellspacing="0" border="0" class="table table-bordered" id="example"> 
<thead> 
<tr> 
<th width="100">Code</th> 
<th width="300">Subject</th> 
<th width="50">Units</th> 
<th>Gen Ave.</th> 
<th>Term</th> 
<th>Year Level</th> 
<th>Remarks</th> 
</tr> 
</thead> 
<tbody> 
<?php $user_query=mysql_query("select * from grade where student_id = '$session_id' and school_year = '$year_level' 
           and semester = '$term' 
           ")or die(mysql_error()); 
while($row=mysql_fetch_array($user_query)){ 
           $id=$row['grade_id']; 
$remarks = $row['remarks']; 
$subject_id = $row['subject_id']; 
$subject_query = mysql_query("select * from subject where subject_id = '$subject_id'")or die(mysql_error()); 
while($subject_row=mysql_fetch_array($subject_query)){ 
?> 
<tr> 
<td> 
<?php echo $subject_row['code']; ?></td> 
<td><?php echo $subject_row['title']; ?></td> 
<td><?php echo $subject_row['unit']; ?></td> 
<td><?php echo $row['gen_ave']; ?></td> 
<td><?php echo $row['semester']; ?></td> 
<td><?php echo $row['school_year']; ?></td> 
<?php if ($remarks == 'Very Good'){ ?> 
<td><span class="very_good"><?php echo $row['remarks']; ?></span></td> 
<?php }else if($remarks == 'Excellent'){ ?> 
<td><span class="Excellent"><?php echo $row['remarks']; ?></span></td> 
<?php }else if($remarks == 'Satisfactory'){ ?> 
<td><span class="sat"><?php echo $row['remarks']; ?></span></td> 
<?php }else if($remarks == 'Fair'){ ?> 
<td><span class="fair"><?php echo $row['remarks']; ?></span></td> 
<?php }else if($remarks == 'Failed'){ ?> 
<td><span class="failed"><?php echo $row['remarks']; ?></span></td> 
<?php }else if($remarks == 'Incomplete'){ ?> 
<td><span class="failed"><?php echo $row['remarks']; ?></span></td> 
<?php }else if($remarks == 'Officially Dropped'){ ?> 
<td><span class="drop"><?php echo $row['remarks']; ?></span></td> 
<?php }else if($remarks == 'PASS'){ ?> 
<td><span class="Excellent"><?php echo $row['remarks']; ?></span></td> 
<?php }else if ($remarks == ''){ ?> 
<td><?php echo $row['remarks']; ?></td> 
<?php } ?> 
</tr> 
<?php }} ?> 
</tbody> 
</table> 
</div> 
<?php include('units_table.php'); ?> 
<?php include('gwa_table.php'); ?> 
<?php include('cwa_table.php'); ?> 
</div> 
<?php include('grading_system.php') ?> 
</div> 
</div> 
</div> 
<?php include('footer.php') ?> 

Answer 1

在你的下面的代碼：

if($num_row > 0) { 
    header('location:dasboard.php'); 
    $_SESSION['id']=$row['student_id']; 
} 

你做

header('location:dasboard.php'); 

之前設置會話：

$_SESSION['id']=$row['student_id']; 

含義重定向第一和會話永遠不會設置。

By the way header.php, includes header.php?

而且

elae{ 
    header('location:access_denied.php'); 
} 

應該是當然的else。