How Long Does a PHP Session ID Last by Default?

Session ID Lifetime Default

When a session is initialized via session_start(), a session ID is assigned to track user activity across page refreshes. By default, this session ID remains valid for a set period of time.

Default Lifetime Duration

The default lifetime of a session is determined by the session.gc_maxlifetime setting in the php.ini configuration file. By default, this value is set to 1440 seconds, equivalent to 24 minutes.

Obtaining a New Session ID

To acquire a new session ID, you must either exceed the session.gc_maxlifetime duration or manually terminate the session using session_destroy(). Refreshing the page after session initialization will not automatically generate a new session ID unless the default lifetime has expired.

Additional Considerations

It's important to note that session lifetime behavior may vary depending on session storage mechanisms and browser settings. For more detailed explanations and strategies for managing session lifetimes, refer to the following resources:

• [PHP Session Configuration](http://www.php.net/manual/en/session.configuration.php)
• [PHP Sessions: Expiring after 30 minutes](https://stackoverflow.com/questions/12650774/how-do-i-expire-a-php-session-after-30-minutes)

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