Why might a PHP session suddenly disappear without explicit commands, and how can this be prevented?

A PHP session may suddenly disappear due to server configuration issues, such as session data being stored in a temporary directory that gets cleared periodically. To prevent this, you can explicitly set the session save path to a permanent directory on your server. 

// Set the session save path to a permanent directory
session_save_path('/path/to/permanent/directory');

// Start the session
session_start();

Keywords

PHP session disappearing prevent session timeout session_regenerate_id

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