search
HomeBackend DevelopmentPHP Tutorialphp下统计用户在线时间的一种尝试_php技巧

下面列出几个比较常用的方法:

首先介绍一下所涉及的数据表结构,四个字段:

复制代码 代码如下:

uid :用户id
session_id :用户登录后系统产生的session_id,PHP可是使用session_id()函数获取
login_time :登录时间
logout_time :登出时间

1. 客户端定时发送请求到服务器端。实现方法是在用户登录后,将uid,session_id,login_time插入一条记录,然后在客户端js设定一个计时器,比如每10分钟向服务器端发送一个请求,以此来达到更新登出时间的目的,当然这个间隔时间设定的越短,数据可能会越准确,不过相应的系统的负载也会越高,这个可以根据实际情况设定一个合适的值。这种方法广泛应用于webgame上,因为webgame的几乎所有请求都是ajax请求,不用刷新页面,一旦刷新页面,这个计时器就失去了价值,这也是这个方法的局限性。
2. 服务器设定一个定时轮询的脚本。这个方法是在服务器端写一个定时执行的脚本,比如5分钟执行一次,根据数据库中的记录来判断每个会话的session_id是否还存在于服务器上,如果存在就更新logout_time,不存在就跳过。这样也能比较准确的统计在线时间,不过缺点是需要有服务器的控制权,不然无法设定定时脚本,linux系统可以通过crontab实现,windows系统可以通过计划任务来完成。如果你只是买的虚拟主机,那么这个方法也同样不适合你。
3. 在用户每次活动时更新一下登出时间。这样在用户不活动或者退出的时候,登出时间就自然而然的存在于数据库里了,这也是本文着重讨论的方案。下面给出实现方法。
首先,在用户登录成功后,记录下其uid,session_id,并将现在时间作为登陆时间,现在时间+600s作为登出时间,插入数据库。
复制代码 代码如下:

$uid = $_SESSION['uid'] = $info['id'];
$session_id = $_SESSION['session_id'] = session_id();
$login_time = time();
$logout_time = time()+600;
$sql = "INSERT INTO member_login (uid,session_id,login_time,logout_time) values($uid,'$session_id',$login_time,$logout_time)";
mysql_query($sql);

然后在用户每次活动,也就是每点击一个页面时,如果session存在也就是处于登录状态时,更新用户登出时间
复制代码 代码如下:

if($_SESSION['uid']){
$uid = $_SESSION['uid'];
$session_id = $_SESSION['session_id'];
$logout_time = time()+600;
$sql = "UPDATE member_login SET logout_time=$logout_time WHERE uid=$uid AND session_id='$session_id'";
mysql_query($sql);
}

这种方法的优点是相对来说实现起来比较简单,能够适用于大多数的网站,没有额外的服务器需求,而且也可以比较准确的统计用户的在线时间。
缺点也很明显,增加了数据库的更新操作,增加了系统的负载,不过对于中小型网站来说应该不是问题。
Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
How can you check if a PHP session has already started?How can you check if a PHP session has already started?Apr 30, 2025 am 12:20 AM

In PHP, you can use session_status() or session_id() to check whether the session has started. 1) Use the session_status() function. If PHP_SESSION_ACTIVE is returned, the session has been started. 2) Use the session_id() function, if a non-empty string is returned, the session has been started. Both methods can effectively check the session state, and choosing which method to use depends on the PHP version and personal preferences.

Describe a scenario where using sessions is essential in a web application.Describe a scenario where using sessions is essential in a web application.Apr 30, 2025 am 12:16 AM

Sessionsarevitalinwebapplications,especiallyfore-commerceplatforms.Theymaintainuserdataacrossrequests,crucialforshoppingcarts,authentication,andpersonalization.InFlask,sessionscanbeimplementedusingsimplecodetomanageuserloginsanddatapersistence.

How can you manage concurrent session access in PHP?How can you manage concurrent session access in PHP?Apr 30, 2025 am 12:11 AM

Managing concurrent session access in PHP can be done by the following methods: 1. Use the database to store session data, 2. Use Redis or Memcached, 3. Implement a session locking strategy. These methods help ensure data consistency and improve concurrency performance.

What are the limitations of using PHP sessions?What are the limitations of using PHP sessions?Apr 30, 2025 am 12:04 AM

PHPsessionshaveseverallimitations:1)Storageconstraintscanleadtoperformanceissues;2)Securityvulnerabilitieslikesessionfixationattacksexist;3)Scalabilityischallengingduetoserver-specificstorage;4)Sessionexpirationmanagementcanbeproblematic;5)Datapersis

Explain how load balancing affects session management and how to address it.Explain how load balancing affects session management and how to address it.Apr 29, 2025 am 12:42 AM

Load balancing affects session management, but can be resolved with session replication, session stickiness, and centralized session storage. 1. Session Replication Copy session data between servers. 2. Session stickiness directs user requests to the same server. 3. Centralized session storage uses independent servers such as Redis to store session data to ensure data sharing.

Explain the concept of session locking.Explain the concept of session locking.Apr 29, 2025 am 12:39 AM

Sessionlockingisatechniqueusedtoensureauser'ssessionremainsexclusivetooneuseratatime.Itiscrucialforpreventingdatacorruptionandsecuritybreachesinmulti-userapplications.Sessionlockingisimplementedusingserver-sidelockingmechanisms,suchasReentrantLockinJ

Are there any alternatives to PHP sessions?Are there any alternatives to PHP sessions?Apr 29, 2025 am 12:36 AM

Alternatives to PHP sessions include Cookies, Token-based Authentication, Database-based Sessions, and Redis/Memcached. 1.Cookies manage sessions by storing data on the client, which is simple but low in security. 2.Token-based Authentication uses tokens to verify users, which is highly secure but requires additional logic. 3.Database-basedSessions stores data in the database, which has good scalability but may affect performance. 4. Redis/Memcached uses distributed cache to improve performance and scalability, but requires additional matching

Define the term 'session hijacking' in the context of PHP.Define the term 'session hijacking' in the context of PHP.Apr 29, 2025 am 12:33 AM

Sessionhijacking refers to an attacker impersonating a user by obtaining the user's sessionID. Prevention methods include: 1) encrypting communication using HTTPS; 2) verifying the source of the sessionID; 3) using a secure sessionID generation algorithm; 4) regularly updating the sessionID.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Atom editor mac version download

Atom editor mac version download

The most popular open source editor

VSCode Windows 64-bit Download

VSCode Windows 64-bit Download

A free and powerful IDE editor launched by Microsoft

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

SublimeText3 English version

SublimeText3 English version

Recommended: Win version, supports code prompts!

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor