PHP $_SESSION Variables: Server-Side or Client-Side Storage?

Unveiling the Storage of $_SESSION Variables: Server vs Client

Question: Where are PHP's $_SESSION variables stored, the client or the server?

Answer:

The answer to this question lies in PHP's session configuration parameter, session.save_path. This setting determines the location where $_SESSION variables are kept. Typically, on Linux/Unix systems, this path defaults to /tmp. However, you can customize the storage location in your server's configuration.

To view your specific settings, create a file in the DocumentRoot of your domain with the following content:

<?php
    phpinfo();
?>

Running this file will generate a detailed PHP information page, where you can locate the configured session.save_path.

For further information, refer to the official PHP documentation on this configuration setting:

https://www.php.net/manual/en/session.configuration.php#ini.session.save-path

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