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In PHP, session_cache_expire is a configuration item used to set the session cache expiration time. It controls the expiration time of PHP session data, which means how long session data remains valid on the server side when there is no activity in the browser. By default, the value of session_cache_expire is 180 minutes (i.e., 3 hours).
In PHP, the default setting for session_cache_expire is 180 minutes, meaning that if a user's session remains active without any interaction, the session data will expire after 180 minutes. This setting is related to the session.gc_maxlifetime configuration item, but they are not the same. session_cache_expire primarily affects the caching of session data, while session.gc_maxlifetime controls the garbage collection mechanism, which cleans up expired session files.
Through the PHP configuration file (php.ini)
The most common way is to modify the session.cache_expire value in the php.ini configuration file. Open the php.ini file and find the following line:
session.cache_expire = 180
Change 180 to the desired cache expiration time (in minutes), for example:
session.cache_expire = 60 ; Set cache expiration time to 60 minutes
After modifying, save the file and restart the web server to apply the changes.
Through code to dynamically modify
If you do not want to modify the PHP configuration file, you can dynamically adjust the value of session_cache_expire at runtime through PHP code. You can use the ini_set() function to change the value:
ini_set('session.cache_expire', 120); // Set cache expiration time to 120 minutes
Note that using ini_set() can only temporarily modify this setting during script execution, so if you need a long-term change, it’s best to configure it through php.ini.
Through the .htaccess file (for Apache)
If you are using an Apache server, you can also adjust the session_cache_expire value through the .htaccess file. Locate or create a .htaccess file in the root directory of your website and add the following line:
php_value session.cache_expire 120
This way, all PHP sessions will use the new cache expiration time (120 minutes).
The default value of session_cache_expire is 180 minutes (3 hours). You can adjust this value through the php.ini configuration file, PHP code, or the .htaccess file, depending on your project’s requirements. Flexibly adjusting the cache expiration time can help you better manage the lifecycle of user sessions.
