How to turn off PHP's automatic logout feature

For web applications developed using PHP, there are many situations where automatic logout is not expected. In some scenarios where you need to stay online for a long time, such as social networking sites, online customer service systems, etc., automatic logout will cause a lot of inconvenience. So how to turn off PHP's automatic logout function?

First of all, we need to understand the principle of automatic logout. In PHP's Session mechanism, in order to prevent the browser from being occupied for a long time without closing the browser, the Session is automatically logged out after a period of time by default. This period is called session.gc_maxlifetime, and its default value is 24 minutes.

To turn off PHP's automatic logout function, we need to set the value of session.gc_maxlifetime to a time much longer than we need, and just modify it in php.ini or code.

In php.ini, we need to find the following line of code:

; 垃圾回收概率
; session.gc_probability=1
; session.gc_divisor=100

Modify it to:

; 垃圾回收概率
session.gc_probability=1
session.gc_divisor=100

; Session 有效时间（半小时，可以根据需要适当修改）
session.gc_maxlifetime = 1800

Save the file and restart the Apache or Nginx server. See the effect.

If you cannot modify php.ini, you can use PHP code to achieve the same effect:

session_start();
// 这里的 604800 相当于 7 天，根据实际需要修改
ini_set('session.gc_maxlifetime', 604800); 
session_set_cookie_params(604800);

The above code will set the value of session.gc_maxlifetime after the session starts, and pass session_set_cookie_params The function specifies the expiration time of the session to achieve the effect of turning off automatic logout.

In short, turning off the PHP automatic logout function requires us to set the value of session.gc_maxlifetime, and whether it is implemented in php.ini or using PHP code depends on the situation. As long as you read the documentation carefully during the development process and master the relevant knowledge, you can easily implement the functions you need.

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