下面我有 5 个 php 脚本按顺序从用户登录到用户注销。现在我正在做的是我正在使用$SESSION来确定哪个用户已登录，然后使用 session_gcmaxlife 添加额外的时间，以便会话不会过期 12 小时。因此，这意味着用户可以保持登录状态 12 小时，在这段时间之后，它将自动注销用户。这只是制作登录系统的一个非常基本的原因。
但我想要做的是能够让用户无限期地保持登录状态，直到他们点击注销链接或关闭浏览器。我的问题是，在尽可能减少代码更改的情况下，如何更改以下代码以使用户保持登录状态，直到用户注销或关闭浏览器？
以下是 php 脚本，以显示当前正在发生的事情：
- Teacherlogin.php（这是用户输入登录详细信息以登录应用程序的脚本）
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<?php
// connect to the database
include('connect.php');
include('member.php');
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
die();
}
// required variables (make them explciit no need for foreach loop)
$teacherusername = (isset($_POST['teacherusername'])) ? $_POST['teacherusername'] : '';
$teacherpassword = (isset($_POST['teacherpassword'])) ? $_POST['teacherpassword'] : '';
$loggedIn = false;
$active = true;
if ((isset($username)) && (isset($userid))){
echo "You are already Logged In: <b>{$_SESSION['teacherforename']} {$_SESSION['teachersurname']}</b> | <a href='./menu.php'>Go to Menu</a> | <a href='./teacherlogout.php'>Logout</a>";
}
else{
if (isset($_POST['submit'])) {
$teacherpassword = md5(md5("g3f".$teacherpassword."rt4"));
// don't use $mysqli->prepare here
$query = "SELECT TeacherId, TeacherForename, TeacherSurname, TeacherUsername, TeacherPassword, Active FROM Teacher WHERE TeacherUsername = ? AND TeacherPassword = ? LIMIT 1";
// prepare query
$stmt=$mysqli->prepare($query);
// You only need to call bind_param once
$stmt->bind_param("ss",$teacherusername,$teacherpassword);
// execute query
$stmt->execute();
// get result and assign variables (prefix with db)
$stmt->bind_result($dbTeacherId, $dbTeacherForename,$dbTeacherSurname,$dbTeacherUsername,$dbTeacherPassword, $dbActive);
while($stmt->fetch()) {
if ($teacherusername == $dbTeacherUsername && $teacherpassword == $dbTeacherPassword) {
if ($dbActive == 0) {
$loggedIn = false;
$active = false;
echo "You Must Activate Your Account from Email to Login";
}else {
$loggedIn = true;
$active = true;
$_SESSION['teacherid'] = $dbTeacherId;
$_SESSION['teacherusername'] = $dbTeacherUsername;
}
}
}
if ($loggedIn == true){
$_SESSION['teacherforename'] = $dbTeacherForename;
$_SESSION['teachersurname'] = $dbTeacherSurname;
header( 'Location: menu.php' ) ;
die();
}
if (!$loggedIn && $active && isset($_POST)) {
echo "<span style='color: red'>The Username or Password that you Entered is not Valid. Try Entering it Again</span>";
}
/* close statement */
$stmt->close();
/* close connection */
$mysqli->close();
}
?>
2. member.php（这个脚本包含$SESSION变量来确定哪个用户登录。这是一个非常重要的脚本并且被包含（使用`include（member.php）能够确定用户是否已经登录） )
<?php
if (isset($_SESSION['teacherforename'])) {
$_SESSION['teacherforename'] = $_SESSION['teacherforename'];
}
if (isset($_SESSION['teachersurname'])) {
$_SESSION['teachersurname'] = $_SESSION['teachersurname'];
}
if (isset($_SESSION['teacherid'])) {
$userid = $_SESSION['teacherid'];
}
if (isset($_SESSION['teacherusername'])) {
$username = $_SESSION['teacherusername'];
}
?>
3. menu.php（这是菜单页面，用户可以使用显示的菜单选择他们希望导航到的页面）
<?php
ini_set('session.gc_maxlifetime',12*60*60);
ini_set('session.gc_divisor', '1');
ini_set('session.gc_probability', '1');
ini_set('session.cookie_lifetime', '0');
require_once 'init.php';
ini_set('display_errors',1);
error_reporting(E_ALL);
session_start();
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Menu</title>
<link rel="stylesheet" type="text/css" href="menu.css">
</head>
<?php
include('member.php');
if ((isset($username)) && (isset($userid))){
include('teachername.php');
?>
<body>
<?php
include('noscript.php');
?>
<ul>
<li><a href="create_session.php">Create an Assessment</a></li>
</ul>
<?php
}else{
echo "Please Login to Access this Page | <a href='./teacherlogin.php'>Login</a>";
}
?>
4 createsession.php（这个页面是用户可以创建考试的地方，只有登录的用户可以访问这个页面）
<?php
ini_set('session.gc_maxlifetime',12*60*60);
ini_set('session.gc_divisor', '1');
ini_set('session.gc_probability', '1');
ini_set('session.cookie_lifetime', '0');
require_once 'init.php';
session_start();
include('member.php');
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<title>Create a New Assessment</title>
<link rel="stylesheet" type="text/css" href="create_sessionStyles.css">
<?php
if ((isset($username)) && (isset($userid))){
?>
<script>
function showConfirm(){
var confirmMsg=confirm(Are you Sure?);
if (confirmMsg==true)
{
submitform();
}
}
function submitform()
{
$.post("insertsession.php", $("#sessionForm").serialize() ,function(data){
var sessionFormO = document.getElementById("sessionForm");
sessionFormO.submit();
});
}
</script>
</head>
<body>
<form action="QandATable.php" method="post" id="sessionForm">
<p><strong>1: Number of Assessments you Require:</strong> <input type="text" id="sessionNo" name="sessionNum" onkeypress="return isNumberKey(event)" maxlength="5" /><br/><span id="sessionNoAlert"></span></p>
<p><strong>2: Duration:</strong> <input type="text" id="durationpicker" name="durationChosen" readonly="readonly" /></p>
<p><strong>3: Date:</strong> <input type="text" id="datepicker" name="dateChosen" readonly="readonly" /></p>
<p><strong>4: Start Time:</strong> <input type="text" id="timepicker" name="timeChosen" readonly="readonly" /><span class="timepicker_button_trigger"><img src="Images/clock.gif" alt="Choose Time" /></span>
</form>
<script type="text/javascript">
function myClickHandler(){
if(validation()){
showConfirm();
}
}
</script>
<?php
}
}
}else{
echo "Please Login to Access this Page | <a href='./teacherlogin.php'>Login</a>";
}
?>
</body>
5teacherlogout.php （最后这是注销页面，当用户单击注销链接（目前仅显示在menu.php中）时，它将转到该页面，并显示一条消息并执行注销销毁会话）
<?php
ini_set('session.gc_maxlifetime',12*60*60);
ini_set('session.gc_divisor', '1');
ini_set('session.gc_probability', '1');
ini_set('session.cookie_lifetime', '0');
require_once 'init.php';
ini_set('display_errors',1);
error_reporting(E_ALL);
session_start();
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Menu</title>
<link rel="stylesheet" type="text/css" href="menu.css">
</head>
<?php
include('member.php');
?>
<body>
<?php
if ((isset($username)) && (isset($userid))){
session_destroy();
echo "You have been Logged Out | <a href='./home.php'>Home</a>";
}
else {
echo "You are Not Logged In";
}
?>
</body>
</html>