How to set session duration in thinkphp

For web development, session is a very important concept. The session mechanism enables the server to track a user's access status, thereby realizing user login status, shopping cart status, etc. When using ThinkPHP to develop web applications, how to set the session life cycle?

By default, ThinkPHP uses PHP's default session mechanism. In PHP, the session life cycle is achieved by setting the session.cookie_lifetime parameter. This parameter defaults to 0, which means the session will continue until the browser is closed. However, if we want to set a specific time period, we need to set this parameter.

The specific setting method is as follows:

In ThinkPHP, the life cycle of the session can be achieved by modifying the session parameters in the config.php file. The config.php file is located in the application directory and is the global settings file of ThinkPHP.

The session parameter is an array, and you can set the following options:

expire: The life cycle of the session, in seconds, the default is 1440 (i.e. 24 minutes). It can be set to 0, indicating that the session continues until the browser is closed; it can also be set to a positive integer, indicating the duration of the session.

type: The storage method of the session, the default is File, that is, stored in a file. It can also be set to other options, such as Memcache, Redis, etc.

prefix: The prefix of the session name, the default is PHPSESSID.

use_trans_sid: Whether to enable transparent Session ID. The default is false, which means using cookies to store the Session ID. If set to true, the Session ID will be passed through the URL to maintain the Session state.

Using the above parameters, we can easily set the life cycle of the session. For example, set the session life cycle to 30 minutes:

return [
    // 默认全局跨域请求支持
    'session' => [
        'expire' => 1800,           // 将会话的生命周期设置为30分钟
    ],
];

Here, we set the expire option in the session array to 1800, indicating that the session life cycle is 30 minutes. Of course, other options can also be set via this method.

In short, setting the session life cycle is a very basic operation and an essential part of web applications. When using ThinkPHP for web development, we must be proficient in this skill so that it can be better applied to actual projects.

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