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# session_id

session_id -- Get and/or set the current session id

## Description

`string session_id`(string [id]);

session_id() returns the session id for the current session. If `id` is specified, it will replace the current session id.

directory used to save session data. If `path` is specified, the path to which data is saved will be changed.

The constant SID can also be used to retrieve the current name and session id as a string suitable for adding to URLs.

> Note: This function was added in PHP 4.0.

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