PHP-使 session 在 X 分钟后过期

Question

我正在使用以下技术...

表单从 login.php 发送到我执行此操作的页面 check.php

<?php    
$uzer = $_POST['user_name'];
$pass = $_POST['user_pass'];

require ('DB_connection.php');

$result = mysql_query("SELECT * FROM accounts WHERE user_Name='$uzer' AND user_Pass='$pass'");

if( mysql_num_rows( $result ) > 0)
{
    $array = mysql_fetch_assoc($result);    

    session_start();
    $_SESSION['user_id'] = $uzer;
    header("Location:loggedin.php");            
}
else
{
    header("Location:login.php");
}
?>

在 loggedin.php 页面上，我做的第一件事是

<?php
session_start();
if( !isset( $_SESSION['user_id'] ) )
{
    header("Location:login.php");
}
else
{
    echo ( "this session is ". $_SESSION['user_id'] );
    //show rest of the page and all
}
?>

但是一旦登录，当我直接输入 url localhost\myProject\loggedin.php 时，它会显示页面...这非常有意义，因为 session 已经开始

我要实现的是

• 直接 URL\ session 在 session 终止\过期\超时后工作 10 分钟，然后用户必须重新登录并可能获得相同的 session ID，但 10 分钟后用户将无法浏览同一届 session

我需要做什么或学什么

Answer 1

在 session 中存储时间戳:

<?php    
$uzer = $_POST['user_name'];
$pass = $_POST['user_pass'];

require ('DB_connection.php');

// Hey, always escape input if necessary!
$result = mysql_query(sprintf("SELECT * FROM accounts WHERE user_Name='%s' AND user_Pass='%s'", mysql_real_escape_string($uzer), mysql_real_escape_string($pass));

if( mysql_num_rows( $result ) > 0)
{
    $array = mysql_fetch_assoc($result);    

    session_start();
    $_SESSION['user_id'] = $uzer;
    $_SESSION['login_time'] = time();
    header("Location:loggedin.php");            
}
else
{
    header("Location:login.php");
}
?>

检查时间戳是否在允许的时间窗口内(600 秒为 10 分钟):

<?php
session_start();
if( !isset( $_SESSION['user_id'] ) || time() - $_SESSION['login_time'] > 600)
{
    header("Location:login.php");
}
else
{
    // uncomment the next line to refresh the session, so it will expire after ten minutes of inactivity, and not 10 minutes after login
    //$_SESSION['login_time'] = time();
    echo ( "this session is ". $_SESSION['user_id'] );
    //show rest of the page and all
}
?>