所以我知道session_start()应该在每个脚本的顶部。像这样：
logins.php
<?php
session_start();
$_SESSION['user_level_id'] = $user_level_id;
header('Location: ' . base_url('views/index.php'));
exit();
并尝试会话：
index.php
<?php
session_start();
var_dump($_SESSION['user_level_id']);
其结果为：
string（1）“ 6”
并在刷新后：
未定义的索引：C：\ xampp \ htdocs \ Framework \ views \ index.php在行
中的user_level_idNULL
我已经看到很多有关在页面刷新时丢失会话的帖子，答案是将session_start（）放在脚本的第一行。但似乎在我的代码中不起作用。
更新：
我尝试创建一个不包含任何内容的文件，在我以前的 logins.php 中，我包含了多个文件。所以我的新文件是这样的：
<?php
session_start();
$_SESSION['user_level_id'] = 'asdf';
session_write_close();
header('Location: /Framework/views/index.php');
die();
以某种方式，在index.php中，该会话未终止。我希望在登录时发布整个代码，以查看是否有任何问题。在这里：
if(isset($_POST['btn_login'])){
$username = $init->post('login_username');
$password = $init->post('login_password');
$_SESSION['logged_in'] = false;
if(!validate([$username, $password])){
header('Location: ' . base_views('index.php?e=1'));
exit();
} else{
$check_username = "SELECT accounts.user_level_id , user_levels.user_level, accounts.account_id
FROM accounts
JOIN user_levels
ON accounts.user_level_id = user_levels.user_level_id
WHERE username = '$username'";
$count = $init->count($check_username);
if($count > 1){
header('Location: ' . base_views('index','e=2'));
exit();
} elseif($count === 0){
header('Location: ' . base_views('index', 'e=3'));
exit();
} else{
$sql = $init->getData($check_username);
$user_level_id = $sql[0]->user_level_id;
$user_level = $sql[0]->user_level;
$account_id = $sql[0]->account_id;
if($user_level_id === '5' || $user_level_id === '6'){
$query = "SELECT accounts.password, students.student_id, names.fname, names.mname, names.lname, positions.position, positions.position_id
FROM accounts
JOIN students ON accounts.account_id = students.account_id
JOIN names ON students.name_id = names.name_id
LEFT JOIN ssc ON ssc.students_id = students.students_id
LEFT JOIN positions ON positions.position_id = ssc.position_id
WHERE accounts.account_id = '$account_id'";
$sql = $init->getData($query);
$student_id = $sql[0]->student_id;
} else{
$query = "SELECT accounts.password, employees.employee_id, names.fname, names.mname, names.lname, positions.position, positions.position_id, positions.office_id, offices.office
FROM accounts
JOIN employees ON employees.account_id = accounts.account_id
JOIN names ON employees.name_id = names.name_id
JOIN positions ON employees.position_id = positions.position_id
JOIN offices ON positions.office_id = offices.office_id
WHERE accounts.account_id = '$account_id'";
$sql = $init->getData($query);
$employee_id = $sql[0]->employee_id;
$office_id = $sql[0]->office_id;
$office = $sql[0]->office;
}
$fname = $sql[0]->fname;
$mname = $sql[0]->mname;
$lname = $sql[0]->lname;
$hash = $sql[0]->password;
$position = $sql[0]->position;
$position_id = $sql[0]->position_id;
if(!password_verify($password, $hash)){
header('Location: ' . base_views('index', 'e=4'));
exit();
} else{
$_SESSION['user_level_id'] = $user_level_id;
$_SESSION['user_level'] = $user_level;
$_SESSION['account_id'] = $account_id;
$_SESSION['full_name'] = "$fname $lname";
$_SESSION['position'] = $position;
$_SESSION['logged_in'] = true;
if($user_level_id === '5'){ // Student
header('Location: ' . base_views('student/index'));
exit();
} elseif($user_level_id === '6'){ // ssc
if($position_id === '14'){
echo "administrator";
} else{
// header('Location: ' . base_views('ssc/index'));
$_SESSION['user_level_id'] = 'asdf';
session_write_close();
header('Location: ' . base_url('views/loader.php'));
die();
}
} elseif($user_level_id === '7'){ // Building Coordinator
header('Location: ' . base_views('bldg_coordinator/index'));
exit();
} elseif($user_level_id === '2'){ // Administration
$_SESSION['office_id'] = $office_id;
$_SESSION['office'] = $office;
switch ($office_id) {
case '11': // Management Information System
header('Location: ' . base_views('mis/index'));
exit();
break;
case '12': // Plant and Facilities
header('Location: ' . base_views('plant_and_facilities/index'));
exit();
break;
case '6': // Office of Student Affairs
header('Location: ' . base_views('student_affairs/index'));
exit();
break;
case '13': // Supreme Student Council Administration
header('Location: ' . base_views('adviser/index'));
exit();
break;
default:
header('Location: ' . base_views('index', 'e=5'));
session_destroy();
exit();
break;
}
} else{
session_destroy();
header('Location: ' . base_views('index', 'e=6'));
exit();
}
}
}
}
}
答案 0 :(得分：1)
如果它是第一次工作，则表明它主要在工作-即传播了必要的cookie等。如果刷新index.php而会话值消失了，则表明该文件中的某个位置值未设置或更改。如果您不小心尝试检查该值，但使用了一个等号=而不是两个==，则可能会发生这种情况：
if ($_SESSION["user_level_id"] = NULL) { // this actually sets the value to null
// BLAH BLAH BLAH
}
或者您可能已经做到了：
unset($_SESSION["user_level_id"]);
如果您没有任何可能进行此更改的代码，则表明该会话可能丢失了。当会话cookie丢失（或以某种方式更改）时，可能会发生这种情况。您是否愿意共享更多代码？
编辑：其他可能性：